Multiply (3 + 4i) (6 + 2i) ?​

Answers

Answer 1

Answer: 10 + 30i

Step-by-step explanation:

(3 + 4i) (6 + 2i)

= 3(6) + 3(2i) + 4i(6) + 4i(2i)    // FOIL method

= 18 + 6i + 24i + 8i^2             // simplify

= 18 + 30i - 8                     // i^2 = -1

= 10 + 30i


Related Questions

your friend is bringing half of a crate of popsicles to the picnic. of you put what is left in the crate evenly into 6 ice buckets, what fraction of the crate will go into each of ice bucket​

Answers

The fraction of crate that will fit in each ice bucket is therefore determined to be - 1/12.

Describe the fraction in detail:

A fraction is a component of a whole. Mathematically, the number is expressed as a quotient, at which numerator and the denominator are divided.

In a simple fraction, both are integers. In a complex fraction, a fraction can be found in either the numerator or the denominator.Proper fractions are those whose numerator is less than their denominator. The fraction is deemed improper when the numerator above the denominator.

data provided

proportion of the friend's crate is equal to half.There are six ice buckets in total.

The number of ice buckets / proportion of crate in each bucket equals fraction of crate provided by friend.

crate fraction in each bucket equals (1/2) / 6

Each bucket's fraction of the crate is 1 / (2*6).

Each bucket's percentage of the crate is 1/12.

The amount of crate that will fit in each ice bucket is therefore determined to be - 1/12.

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The sum or difference of two fractions is not in _______________

Answers

The sum or difference of two fractions is not in Improper form.

What is Fraction?

Fraction is a part of a whole number. It is represented by two numbers separated by a line. The top number is called the numerator and the bottom number is called the denominator. The numerator represents the number of parts of the whole, and the denominator represents the total number of parts. For example, 1/2 is a fraction that represents one part of a whole that is divided into two equal parts. Fractions are used in many mathematical calculations such as addition, subtraction, multiplication and division.

When adding or subtracting fractions, it is important to first convert the fractions to improper form. Improper form is when the numerator (the top number of the fraction) is larger than the denominator (the bottom number of the fraction). For example, the improper form of 1/2 is 3/2.

To convert a fraction to its improper form, simply multiply the numerator and denominator by the same number. For example, let’s convert the fraction 1/2 to its improper form. To do this, we multiply the numerator (1) and denominator (2) by 2. This gives us 2/4, which is the same as 3/2 (the improper form).

Once all the fractions have been converted to improper form, they can be added or subtracted by simply adding or subtracting the numerators (top numbers) and keeping the denominator (bottom number) the same.

For example, let’s say we want to add 3/4 and 1/2. To do this, we convert both fractions to improper form: 3/4 becomes 6/4, and 1/2 becomes 3/2. Then, we add the numerators (6 + 3 = 9) and keep the denominator the same (4). This gives us the answer of 9/4.

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Complete questions as follows-
The sum or difference of two fractions is not in _______________ form.

Please help thank you

Answers

The values of sine, cosine, and tangent of the angle 'θ' are: sinθ = [tex]\frac{1}{2}[/tex],

cosθ = [tex]\frac{\sqrt{3}}{2}[/tex]  and tanθ = [tex]\frac{1}{\sqrt{3} }[/tex] .

How to find trignometric ratios far an angle?

To begin, determine the angle for which you wish to compute trigonometric ratios. Let's call the angle "θ".

Find the lengths of the sides of the right triangle that correspond to the angle "θ". Choose the trigonometric ratio you wish to calculate: sine (sin), cosine (cos), or tangent (tan).

Now, using the proper trigonometric formula, determine the needed ratio:

            sin θ [tex]= \frac{Opposite side}{Hypotenuse }[/tex]

            cos θ [tex]= \frac{Adjacent side }{Hypotenuse}[/tex]

            tan θ [tex]= \frac{Opposite side }{Adjacent side}[/tex]

In the given problem, values for angle θ are-:

opposite side = 4 and Adjacent side = 4[tex]\sqrt{3}[/tex]

Using Pythagorean theorem to find the value of hypotenuse:

[tex]hypotenuse = \sqrt{(opposite^2 + adjacent^2)}[/tex]

[tex]hypotenuse=\sqrt{4^{2}+(4\sqrt{3})^2 } =\sqrt{16+48} =\sqrt{64} =8[/tex]

Now, putting values to find required trignometric ratios-:

sin θ[tex]= \frac{Opposite side}{Hypotenuse }=\frac{4}{8 }=\frac{1}{2}[/tex]

cos θ[tex]= \frac{Adjacent side }{Hypotenuse} =\frac{4\sqrt{3}}{8}=\frac{\sqrt{3}}{2}[/tex]

tan θ [tex]= \frac{Opposite side }{Adjacent side}=\frac{4}{4\sqrt{3}}=\frac{1}{\sqrt{3} }[/tex]

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a plumber works twice as fast as his apprentice. after the plumber has worked alone for 3 hours, his apprentice joins him and working together they complete the job 4 hours later. how many hours would it have taken the plumber to do the entire job by himself?

Answers

If after the plumber has worked alone for 3 hours, his apprentice joins him and working together they complete the job 4 hours later, it would take the plumber 9 hours to do the entire job by himself.

Let's start by assigning some b to represent the rate at which each person works. Let's say that the plumber's rate is P (in units of job per hour) and the apprentice's rate is A (also in units of job per hour). Since the plumber works twice as fast as the apprentice, we can write:

P = 2A

Next, let's think about how much work can be done in a certain amount of time. If the plumber works alone for 3 hours, he completes 3P units of work. When the apprentice joins him, they work together for another 4 hours to complete the entire job, which is a total of 7 hours of work. So, the amount of work done in those 4 hours is:

4(P + A)

We also know that the total amount of work is 1 (since it's one complete job). Putting this all together, we can write an equation:

3P + 4(P + A) = 1

We can simplify this to:

7P + 4A = 1

But we also know that P = 2A, so we can substitute that in:

7(2A) + 4A = 1

Simplifying this, we get:

18A = 1

So, A = 1/18. This means that the apprentice can complete 1/18 of the job in one hour. Since the plumber works twice as fast, he can complete 2/18 of the job (or 1/9) in one hour.

To find out how long it would take the plumber to do the entire job by himself, we can use the formula:

Time = Work / Rate

The entire job is 1, and the plumber's rate is 1/9. So:

Time = 1 / (1/9) = 9 hours

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Answer questions 1 to 5.​

Answers

The overall shapes of the distributions are symmetric  and right skewed

The overall shape of the distribution

In statistics, a distribution is considered symmetric if the right and left halves of the distribution are mirror images of each other.

In this case, the overall shape of the distribution is symmetric

The mean absolute deviation

From the dot plot, we have the following readings

0,3,4,5,5,6,6,7,7,8,8

Using a graphing tool, we have

Mean absolute deviation = 1.79

The overall shape of the distribution

A right-skewed distribution is a type of probability distribution where the majority of the data values are clustered on the left side of the distribution, while a few large values extend out to the right side.

In this case, the overall shape of the distribution is right skewed

The true statement about the distribution

From the histogram, the true statement about the distribution is that the distribution has an outlier

The datapoints for the last question are not given

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The volume of a cylinder is given by the formula v - pi^h, where r is the radius of the cylinder and h is the height.
Which expression represents the volume of this cylinder?

Answers

The expression that represents the volume of the cylinder is:

V = π[tex]r^{2}[/tex]h

What is cylinder?

A cylinder is a three-dimensional geometric shape that consists of two parallel circular bases of the same size and shape, and a curved lateral surface connecting the bases. The cylinder can be thought of as a tube or a can. The lateral surface of the cylinder is formed by "unrolling" a rectangular shape along the circumference of the base.

There appears to be a typographical error in the given formula for the volume of a cylinder. The correct formula is:

V = π[tex]r^{2}[/tex]h

where V is the volume of the cylinder, r is the radius of the circular base, and h is the height of the cylinder.

Using this formula, the expression that represents the volume of the cylinder is:

V = π[tex]r^{2}[/tex]h

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some airlines have restrictions on the size of items of luggage that passengers are allowed to take with them. suppose that one has a rule that the sum of the length, width and height of any piece of luggage must be less than or equal to 180 cm. a passenger wants to take a box of the maximum allowable volume. if the length and width are to be equal, what should the dimensions be?length

Answers

the maximum dimensions of the box would be 60 cm x 60 cm x 60 cm in order to have the maximum allowable volume while still meeting the airline's luggage restrictions.

If the length and width of the box are equal, we can call the length and width x. Then, the height of the box would also be x in order to maximize the volume.

The sum of the length, width, and height of the box would be:

x + x + x = 3x

We know that the sum of the length, width, and height must be less than or equal to 180 cm. So:

3x ≤ 180

Simplifying, we get:

x ≤ 60

Therefore, the maximum dimensions of the box would be 60 cm x 60 cm x 60 cm in order to have the maximum allowable volume while still meeting the airline's luggage restrictions.

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Dimensions, the sum of the length, width, and height is 360 cm.

Let's assume that the length, width, and height of the box are all equal to

x cm. Since the length and width are equal, we can write:

Length = Width = x

The volume of the box can be expressed as:

Volume = Length x Width x Height

Volume = x × x × (180 - 2x) (since the height is equal to 180 - length - width)

To find the dimensions of the box that would give us the maximum volume, we need to differentiate the volume function with respect to x and set it equal to zero:

[tex]dV/dx = 3x^2 - 360x = 0[/tex]

Solving this equation, we get:

x = 0 or x = 120

Since x cannot be zero, the only possible value for x is 120 cm. Therefore, the dimensions of the box should be:

Length = Width = Height = 120 cm

With these dimensions, the sum of the length, width, and height is:

Length + Width + Height = 120 + 120 + 120 = 360 cm

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Find the slope of a line perpendicular to the line whose equation is
4


2

=
20
4x−2y=20. Fully simplify your answer

Answers

the slope of the line perpendicular to 4x - 2y = 20 is -1/2, which can also be expressed as 1/(-2). This means that the line perpendicular to the given line has a slope that is the negative reciprocal of the slope of the given line.

How to solve the question?

To find the slope of a line perpendicular to the given line, we first need to find the slope of the given line. We can do this by putting the equation of the line in slope-intercept form, y = mx + b, where m is the slope and b is the y-intercept.

Starting with the equation of the line, 4x - 2y = 20, we can isolate y on one side by subtracting 4x from both sides and then dividing by -2. This gives us:

-2y = -4x + 20

y = 2x - 10

Comparing this equation with the slope-intercept form, we can see that the slope of the line is 2.

To find the slope of a line perpendicular to this line, we need to use the fact that the product of the slopes of two perpendicular lines is -1. That is, if the slope of the given line is m, then the slope of a line perpendicular to it is -1/m.

So, the slope of the line perpendicular to 4x - 2y = 20 is:

-1/2

To fully simplify this answer, we can write it as a fraction with a positive numerator by multiplying both the numerator and denominator by -1:

1/(-2)

Therefore, the slope of the line perpendicular to 4x - 2y = 20 is -1/2, which can also be expressed as 1/(-2). This means that the line perpendicular to the given line has a slope that is the negative reciprocal of the slope of the given line.

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A bag contains all the letters in the word MATHEMATICS. You draw two letters, one at a time. What is the probability of drawing a T, replacing it, then drawing a C?

Answers

2 x 10-7  is the probability of drawing a T, replacing it, then drawing a C.

What is Probability?

Probability is simply the chance that something will happen. Whenever the outcome of an event is uncertain, we can speak of the probability, or likelihood, of a particular outcome. Analyzing events according to their probabilities is called statistics

There are 11 letters in MATHEMATICS which consist of 2 each of M, A and T and 1 each of H, E, I, C and S.  

P(M on 1st choice) = 2/11   since there are 2 M's out of 11 letters

P(A on 2nd choice) = 2/10   since there are 2 A's out of 10 remaining letters

P(T on 3rd choice) = 2/9     since there are 2 T's out of 9 remaining letters

At this point there are 8 letters remaining which are all distinct so they must be chosen in the correct order

P(H on 4th choice) = 1/8

P(E on 5th choice) = 1/7

P(M on 6th choice) = 1/6

P(A on 7th choice) = 1/5

P(T on 8th choice) = 1/4

P(I on 9th choice) = 1/3

P(C on 10th choice) = 1/2

P(S on 11th choice) = 1/1  

The probability of spelling the word correctly is the product of all the probabilities

P = 2*2*2 / 11! = 8 / 39916800 = 1 / 4989600 ~ 2 x 10-7

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Please help fill in this chart

Answers

The point where marginal cost equals $15 is at the production of the 7th pizza. Therefore, the firm should produce 7 pizzas.

What is the firm's shut-down price?

The firm's shut-down price is the price at which the firm is indifferent between producing and shutting down.

Using the table provided, we can calculate the missing values:

Variable Cost:

For 0 pizzas, the variable cost is $0.

For 1 pizza, the variable cost is $10.

For 2 pizzas, the variable cost is $12.

For 3 pizzas, the variable cost is $2.

For 4 pizzas, the variable cost is $1.

For 5 pizzas, the variable cost is $2.

For 6 pizzas, the variable cost is $3.

For 7 pizzas, the variable cost is $13.

For 8 pizzas, the variable cost is $16.

For 9 pizzas, the variable cost is $3.

For 10 pizzas, the variable cost is $6.

For 11 pizzas, the variable cost is $4.

Total Cost: To calculate the total cost, we simply add the variable cost and the fixed cost for each level of output. The fixed cost is not given in the table, so we cannot calculate the total cost.

Average Variable Cost:

To calculate the average variable cost, we divide the variable cost by the level of output. For example, the average variable cost for 1 pizza is $10/1 = $10.

Average Fixed Cost:To calculate the average fixed cost, we divide the fixed cost by the level of output.

Average Total Cost: To calculate the average total cost, we add the average variable cost and the average fixed cost. The firm should produce pizzas up to the point where marginal cost equals marginal revenue.

This is the point where the firm maximizes its profit. From the table, we can see that the marginal cost is increasing as output increases, while the marginal revenue remains constant at $15.

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A boat is heading towards a lighthouse, whose beacon-light is 111 feet above the water. From point A, the boat’s crew measures the angle of elevation to the beacon, 6∘ before they draw closer. They measure the angle of elevation a second time from point B at some later time to be 13∘ . Find the distance from point A to point B. Round your answer to the nearest tenth of a foot if necessary.

Answers

The distance from point A to point B is approximately 926.4 feet.

What is angle?

An angle is a measure of the amount of rotation between two lines, rays, or line segments that share a common endpoint, called the vertex. It is typically measured in degrees or radians.

According to question:

Let's call the distance between point A and the lighthouse "x" and the distance between point B and the lighthouse "y". We want to find the value of "y".

From point A, the crew measures the angle of elevation to the lighthouse to be 6. This means that the angle formed between the horizontal line passing through point A and the line connecting point A to the top of the lighthouse is 6. We can draw a right triangle ABC where point A is the bottom left corner, point B is the bottom right corner, and point C is the top of the lighthouse. The line segment AC represents the height of the lighthouse (111 feet) and the line segment AB represents the distance between point A and the lighthouse (x).

Using trigonometry, we know that:

tan(6) = AC/AB

tan(6) = 111/x

x = 111/tan(6)

Now, from point B, the crew measures the angle of elevation to the lighthouse to be 13. This means that the angle formed between the horizontal line passing through point B and the line connecting point B to the top of the lighthouse is 13. We can draw a right triangle BCD where point B is the bottom left corner, point C is the top of the lighthouse (the same point as in the previous triangle), and point D is the bottom right corner. The line segment CD represents the height of the lighthouse (111 feet) and the line segment BD represents the distance between point B and the lighthouse (y).

Using trigonometry, we know that:

tan(13) = CD/BD

tan(13) = 111/y

y = 111/tan(13)

Therefore, the distance between point A and point B is:

y - x = 111/tan(13) - 111/tan(6)

Using a calculator, we get:

y - x ≈ 926.4 feet

Rounding to the nearest tenth of a foot, the distance from point A to point B is approximately 926.4 feet.

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please help!

If r=0.5 m, A = ???

(Use the r key.)

Answers

The area of a circle of radius of 0.5 meters is 0.785 square meters.

How to find the area of the circle?

Remember that for a circle of radius r, the area is:

A = pi*r²

Where pi = 3.14

Here we know that r = 0.5m, then we can input that in the formula for the area that is above, we will get.

A = 3.14*(0.5m)²

A = 3.14*0.25 m²

A = 0.785  m²

That is the area of the circle.

Complete question: Let's say that r is the radius of a circle and A is its area, then: If r=0.5 m, A = ?

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4. You want to use ribbon to create a border along the edge of the paper. The length of the paper is 2 times as long as the width. How much ribbon do you need to create the border? O 41/2 feet O 43/5 feet O 41/4 feet 4 4/5 feet ​

Answers

The amount of ribbon you need to create the border is 4 1/4 feet if x = 17/24

How much ribbon do you need to create the border?

From the question, we have the following parameters that can be used in our computation:

The length of the paper is 2 times as long as the width

This means that

Length = 2x

Width = x

The perimeter is

Perimeter = 2 * (2x + x)

Perimeter = 6x

Assuming that x = 17/24

So, we have

Perimeter = 6 * 17/24

Evaluate

Perimeter = 17/4

Simplify

Perimeter = 4 1/4

Hence, the amount needed is 4 1/4 feet

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What is the volume of 1 hemisphere created by cutting this sphere exactly in half?

Answers

Answer:

B. 1152π cm^3

Step-by-step explanation:

I'm 99.9% sure that this is correct!

I'm really really sorry if it's not! please tell me if I'm wrong!

the mass of the box on a table is 20kg. a man applied force as below the picture. the static frictional coefficient is 0.6 and the dynamic frictional coefficient is 0.5. (gravitational acceleration =10ms^{-2}

1)what is the minimum force that should be applied to move the box?
2)What is the force that should apply to move in uniform velocity?

Answers

Okay, let's solve this problem step-by-step:

1) To move the box initially, the applied force (F) must overcome static friction.

Static frictional force = F_static = μ_static * Weight of box

= 0.6 * 20kg * 10m/s^2

= 12N

So the minimum force to move the box is 12N.

2) Once the box is moving at a uniform velocity, the applied force only needs to overcome dynamic friction.

Dynamic frictional force = F_dynamic = μ_dynamic * Weight of box

= 0.5 * 20kg * 10m/s^2

= 10N

So to keep the box moving at a constant velocity, the applied force should be 10N.

In summary:

Minimum force to move the box (static friction) = 12N

Force to move at constant velocity (dynamic friction) = 10N

Let me know if you have any other questions!

What are the cross-products of the proportion 6/40 = 9/60? Is the proportion TRUE?

54 and 2,400; the proportion is false.

54 and 540; the proportion is true.

360 and 360; the proportion is true.

Answers

Therefore, the answer is: 360 and 360; the proportion is true.

54 and 540; the proportion is true.

360 and 360; the proportion is true.

To find the cross-products of the proportion 6/40 = 9/60, we multiply the numerator of the first fraction by the denominator of the second fraction, and the numerator of the second fraction by the denominator of the first fraction.

So we have:

6 × 60 = 360

9 × 40 = 360

The cross-products are 360 and 360.

To check if the proportion is true, we compare the cross-products. If they are equal, then the proportion is true; otherwise, it is false.

Since the cross-products are equal, the proportion is true.

Therefore, the answer is:

360 and 360; the proportion is true.

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3(x + y) = y
If (x, y) is a solution to the equation above and
y = 0, what is the ratio * ?

Answers

The answer to this question is x:0

the random variable x is the number of occurrences of an event over an interval of 10 minutes. it can be assumed the probability of an occurrence is the same in any two time periods of an equal length. it is known that the mean number of occurrences in 10 minutes is 5.3. the probability there are 8 occurrences in 10 minutes is . a. .0771 b. .0241 c. .1126 d. .9107

Answers

The probability of having 8 occurrences in 10 minutes is approximately 0.0241, which means the answer is (b).

The number of occurrences of an event in 10 minutes as a Poisson distribution with mean lambda = 5.3.

The probability of having 8 occurrences in 10 minutes is:

[tex]P(X = 8) = (e^(-5.3) * 5.3^8) / 8![/tex]

where X is the random variable representing the number of occurrences of the event in 10 minutes.

Using a calculator, we can evaluate this expression:

[tex]P(X = 8) = (e^(-5.3) * 5.3^8) / 8! ≈ 0.0241[/tex]

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HELP ASAPPPPPP Kendra is filling cone-shaped baskets, each with a height of 20 inches and a radius of 6 inches to use as

table decorations.

In terms of , what is the exact volume of each cone-shaped basket?

Answers

The exact volume of each cone-shaped basket is (240/π) cubic inches.

The formula for the volume of a cone is,

V = (1/3)πr^2h

Where,

V is the volume of the cone

π is the mathematical constant pi (approximately 3.14159)

r is the radius of the base of the cone

h is the height of the cone

In this case, the height of the cone-shaped basket is 20 inches and the radius is 6 inches. So, substituting these values into the formula,

V = (1/3)π(6^2)(20)

V = (1/3)π(36)(20)

V = (1/3)π(720)

V = (240/π) cubic inches

Hence, volume is (240/π) cubic inches.

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in an integer overflow attack, an attacker changes the value of a variable to something outside the range that the programmer had intended by using an integer overflow.T/F

Answers

True. An integer overflow attack occurs when an attacker manipulates a variable in a way that causes it to exceed its maximum value or minimum value, leading to unexpected and potentially harmful behavior.

This can happen if a programmer fails to properly check and validate the input values that are being used in their code, allowing an attacker to inject a value that triggers an overflow.

As a result, the variable may be assigned a value that is outside the intended range, leading to unpredictable behavior and potentially causing the program to crash or execute unintended code. It is important for programmers to take steps to prevent integer overflow attacks, such as validating input values and using data types with sufficient capacity to hold the expected range of values.


This occurs when an arithmetic operation results in a value that is too large to be stored in the allocated memory, causing the value to wrap around and become smaller, or even negative. This can lead to unintended consequences in a program's behavior, which an attacker can exploit to gain unauthorized access or cause other security issues.

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armer abe has a budget of $300 to build a rectangular pen to protect his rambunctious sheep. he decides that three sides of the pen will be constructed with chain-link fence, which costs only $1 per foot. farmer abe decides that the fourth side of the pen will be made with sturdier fence, which costs $5 per foot. find the dimensions of the largest area the pen can enclose.

Answers

Let x be the length of the pen and y be the width of the pen.

The total cost of the pen is given by:

Cost = 3x + 5y = 300

3x + 5y = 300

3x = 300 - 5y

x = (300 - 5y)/3

The area of the pen is given by:

Area = xy = (300 - 5y)/3 * y

A pistol is accidently discharged vertically in the air. The height, h, of the bullet at time t seconds is recorded in the table below. Using an equation to model the data, find the height of the pistol after 10 seconds.

t (sec)
0
1
2
3
4
h (ft)
3
187
339
459
547

Answers

The height of the pistol after 10 seconds is 783 feet.

How to  find the height of the pistol after 10 seconds.

We can use the method of finite differences to find the degree of the polynomial function that models the data. The first differences are:

3, 18, 37, 56, 72

The second differences are:

15, 19, 19, 16

Since the second differences are constant, we know that the function that models the data is a quadratic function of the form:

h(t) = at² + bt + c

where a, b, and c are constants to be determined.

To find a, we can use the fact that the coefficient of t² in the quadratic function is equal to half of the second difference. Thus, we have:

a = 1/2(15) = 7.5

To find b, we can use the fact that the coefficient of t in the quadratic function is equal to the first difference minus twice the coefficient of t². Thus, we have:

b = 18 - 2(7.5) = 3

To find c, we can use the fact that the constant term in the quadratic function is equal to the value of h(0). Thus, we have:

c = h(0) = 3

Therefore, the equation that models the data is:

h(t) = 7.5t² + 3t + 3

To find the height of the pistol after 10 seconds, we can substitute t = 10 into the equation:

h(10) = 7.5(10)² + 3(10) + 3

h(10) = 750 + 30 + 3

h(10) = 783

Thus, the height of the pistol after 10 seconds is 783 feet.

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the sample variances is calculated by? a. the sum of all squared differences between actual values and the overall mean b. the sum of all squared differences between actual values and the overall mean divided by the total number of observations less one c. the sum of all squared differences between actual values and the overall mean divided by the total number of observations. d. none of the above

Answers

The sample variances is calculated by option b, which is the sum of all squared differences between actual values and the overall mean divided by the total number of observations less one.

The sample variance is calculated by the sum of all squared differences between actual values and the overall mean divided by the total number of observations less than one.

How are the sample variances calculated?a) the sum of all squared differences between actual values and the overall mean b) the sum of all squared differences between actual values and the overall mean divided by the total number of observations less one c) the sum of all squared differences between actual values and the overall mean divided by the total number of observations. d) none of the above

The sample variance is a measure of the spread of a sample data set. It measures how far each value in the set is from the mean of the set. The formula for the sample variance involves taking the sum of the squared differences between each data point and the mean, and then dividing that sum by the total number of observations minus one. Dividing by the number of observations minus one instead of just the number of observations is known as Bessel's correction and is used to correct for bias in the sample variance calculation. The resulting value represents the average squared deviation from the mean, and is often used as an estimate of the population variance. Therefore, the sample variance is calculated by the sum of all squared differences between actual values and the overall mean divided by the total number of observations less than one.

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The table represents a linear relationship.


x −1 0 1
y −3 1 5


Which equation represents the table?

A. y equals one fourth times x minus 2
B. y equals negative one fourth times x plus 1
C. y = −4x − 2
D. y = 4x + 1

Answers

Answer:

[tex]d) \ y=4x+1[/tex]

Step-by-step explanation:

I suppose the table looks like this:

[tex]\begin{array}{|r|r|} x & y \\ \cline{0-1}-1 & -3 \\0 & 1 \\ 1 & 5\end{array}[/tex]

Thus, we can select two points and apply the formula for the equation of a line given two points to derive an equation that represents the table.

[tex]y-y_1=(\frac{y_2-y_1}{x_2-x_1} )(x-x_1)[/tex]

I select this points:

[tex](x_1,y_1)= (0,1)\\(x_2,y_2)= (1,5)[/tex]

Now, we substitute this values in the previous equation:

[tex]y-(1)=(\frac{5-1}{1-0} )(x-0)\\\\y-1=4 x\\y=4x+1[/tex]

Therefore, the correct answer it's option D

Gemma can't type 350 words in five minutes how many words can she type in 3/4 of an hour

Answers

Answer:

Gemma can type 3150 words in 3/4hr

Step-by-step explanation:

350 word------>five minutes

x words------->3/4hr

convert 3/4hr-minutes

3/4×60=45minutes

x word =350×45/5

x word=3,150 words

convert this denary number 33 to a binary number​

Answers

Answer: 100001

Step-by-step explanation: The trick for binary is that it only uses 1 & 0 for its number system. It goes by a system where you take 1 and multiply by 2, then you multiply 2 by 2, and so forth. So 33 has one 32, and one 1.

pls pls help. just need the answer

Answers

The value of k is given as follows:

k = 5.

How to obtain the value of k?

The function in the context of this problem is defined as follows:

f(x) = x³ + kx - 6.

We have that x - 1 is a factor of the function, meaning that, by the Factor Theorem:

f(1) = 0, x - 1 = 0 -> x = 1.

Hence, applying the numeric value, the value of k is obtained as follows:

1 + k - 6 = 0

k - 5 = 0

k = 5.

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fuel efficiency of manual and automatic cars, part i. each year the us environmental protection agency (epa)releases fuel economy data on cars manufactured in that year. below are summary statistics on fuel efficiency (in miles/gallon) from random samples of cars with manual and automatic transmissions. do these data provide strong evidence of a difference between the average fuel efficiency of cars with manual and automatic transmissions in terms of their average city mileage? assume that conditions for inference are satisfied.

Answers

Given the above prompt on hypothesis testing, we can state that specifically, cars with manual transmissions have a significantly higher average city mileage than those with automatic transmissions.

What is the explanation for the above response?


To determine if there is strong evidence of a difference between the average fuel efficiency of cars with manual and automatic transmissions in terms of their average city mileage, we can conduct a two-sample t-test assuming unequal variances. The null hypothesis is that there is no difference in the average city mileage between the two types of transmissions, and the alternative hypothesis is that there is a difference.

The t-test statistic is calculated as follows:

t = (x1 - x2) / sqrt((s1^2/n1) + (s2^2/n2))

where x1 and x2 are the sample means, s1 and s2 are the sample standard deviations, and n1 and n2 are the sample sizes.

Plugging in the values from the given statistics, we get:

t = (16.12 - 19.85) / sqrt((3.85^2/26) + (4.51^2/26))

t = -3.31

Using a significance level of 0.05 and 50 degrees of freedom (approximated by n1+n2-2), the critical t-value is ±2.01.

Since the calculated t-value (-3.31) is less than the critical t-value, we can reject the null hypothesis and conclude that there is strong evidence of a difference between the average fuel efficiency of cars with manual and automatic transmissions in terms of their average city mileage.

Specifically, cars with manual transmissions have a significantly higher average city mileage than those with automatic transmissions.

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Full Question:

Although part of your question is missing, you might be referring to this full question: See attached image.

What is the argument of z = StartFraction 1 Over 16 EndFraction minus StartFraction StartRoot 3 EndRoot Over 16 EndFraction i?

Answers

To find the argument of the complex number z = 1/16 - (sqrt(3)/16)i, we need to find the angle that the complex number forms with the positive real axis in the complex plane.

We can start by finding the magnitude of z, which is the distance between the origin and the point representing z in the complex plane:

|z| = sqrt( (1/16)^2 + (sqrt(3)/16)^2 )

= sqrt(1/256 + 3/256)

= sqrt(4/256)

= 1/4

Next, we can find the argument of z using the formula:

arg(z) = tan^(-1)(Im(z)/Re(z))

where Im(z) is the imaginary part of z, and Re(z) is the real part of z.

In this case, we have:

Re(z) = 1/16

Im(z) = -(sqrt(3)/16)

Therefore, we get:

arg(z) = tan^(-1)(Im(z)/Re(z))

= tan^(-1)(-(sqrt(3)/16)/(1/16))

= tan^(-1)(-sqrt(3))

= -60° (in degrees)

So, the argument of z is -60 degrees (or -π/3 radians).

Answer:

A

Step-by-step explanation:

A helicopter hovering above a command post shines a spotlight on an object on the ground 250 feet away from the command post as shown in the diagram how far is the object from the helicopter to the nearest foot

Answers

The distance of the object from the helicopter is 698 ft.

What is distance?

Distance is the length between two points.

To calculate how far the object is above the helicopter, we use the formula below.

Formula:

Sin∅ = O/H..................... Equation 1

Where:

∅ = AngleO = OppositeH = Hypotenus = Distance of the object from the Helicopter

From the question,

Given:

O = 250 ft∅  = 21°

Substitute these values into equation 1 and solve for H

H = 250/Sin21°H = 697.61 ftH ≈ 698 ft

Hence, the distance is 698 ft.

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