Can you guys help me do thus

Can You Guys Help Me Do Thus

Answers

Answer 1

Answer:

(a)  x = 6.71 cm (3 s.f.)

     θ = 30.8° (3 s.f.)

(b)  radius = 3.00 cm (3 s.f.)

Step-by-step explanation:

Part (a)

The given triangle is made up of two right triangles.

In the right triangle on the right side, the side labelled "x" is opposite angle 40° and the side labelled 8 cm is adjacent to angle 40°. Therefore, to find the length of side x, use the tangent trigonometric ratio.

[tex]\boxed{\begin{minipage}{7 cm}\underline{Tangent trigonometric ratio} \\\\$\sf \tan(\theta)=\dfrac{O}{A}$\\\\where:\\ \phantom{ww}$\bullet$ $\theta$ is the angle. \\ \phantom{ww}$\bullet$ $\sf O$ is the side opposite the angle. \\\phantom{ww}$\bullet$ $\sf A$ is the side adjacent the angle.\\\end{minipage}}[/tex]

Therefore, the values are:

θ = 40°O = xA = 8 cm

Substitute the values into the equation and solve for x:

[tex]\implies \tan 40^{\circ}=\dfrac{x}{8}[/tex]

[tex]\implies 8 \cdot \tan 40^{\circ}=8 \cdot\dfrac{x}{8}[/tex]

[tex]\implies 8 \tan 40^{\circ}=x[/tex]

[tex]\implies x=8 \tan 40^{\circ}[/tex]

[tex]\implies x=6.71279704...[/tex]

[tex]\implies x=6.71\; \rm cm\;(3\;s.f.)[/tex]

Therefore, the length of side x is 6.71 cm (3 s.f.).

In the right triangle on the left side, the side labelled "x" is adjacent angle θ and the side labelled 4 cm is opposite to angle θ. Therefore, to find the size of angle θ, use the tangent trigonometric ratio.

Therefore, the values are:

θ = θO = xA = 4 cm

Substitute the values into the equation and solve for x:

[tex]\implies \tan \theta=\dfrac{4}{x}[/tex]

[tex]\implies \tan \theta=\dfrac{4}{8 \tan 40^{\circ}}[/tex]

[tex]\implies \tan \theta=\dfrac{1}{2 \tan 40^{\circ}}[/tex]

[tex]\implies \theta=\tan^{-1}\left(\dfrac{1}{2 \tan 40^{\circ}}\right)[/tex]

[tex]\implies \theta=30.7897330...^{\circ}}[/tex]

[tex]\implies \theta=30.8^{\circ}}\; \rm (3\;s.f.)[/tex]

Therefore, the size of angle θ is 30.8° (3 s.f.).

[tex]\hrulefill[/tex]

Part (b)

The formula for the volume of a cylinder is:

[tex]\boxed{V=\pi r^2 h}[/tex]

where:

V is the volume.r is the radius.h is the height.

Given values:

height, h = 5.3 cmvolume, V = 150 cm³

Substitute the given values into the formula and solve for r:

[tex]\implies \pi \cdot r^2 \cdot 5.3 = 150[/tex]

[tex]\implies r^2=\dfrac{150}{5.3\pi}[/tex]

[tex]\implies \sqrt{r^2}=\sqrt{\dfrac{150}{5.3\pi}}[/tex]

[tex]\implies r=\sqrt{9.00877036...}[/tex]

[tex]\implies r=3.00146137...[/tex]

[tex]\implies r=3.00\; \rm cm\;(3\;s.f.)[/tex]

Therefore, the radius of the cylinder is 3.00 cm (3 s.f.)


Related Questions

What is the y-intercept of this quadratic function? f(x) = -x^2 +10x-22The y-intercept of function f is ( , ).

Answers

Answer:

-22

Step-by-step explanation:

This is the result of the operation, in the image, the answer is all the way at the bottom, hope this helps

Please help answer this question.

Answers

The value of tan 25° to the nearest hundred is,

⇒ 0.47

And, The value of sin 49° to the nearest tenth is,

⇒ 0.8

We have to given that;

To find the value of tan 25° and sin 49°

Now, We know that;

⇒ tan 25° = 0.4667

Rounded to the nearest hundred,

⇒ tan 25° = 0.47

And, We get;

⇒  sin 49° = 0.754

Rounded to the nearest tenth,

⇒ sin 49° = 0.8

Thus, The value of tan 25° to the nearest hundred is,

⇒ 0.47

And, The value of sin 49° to the nearest tenth is,

⇒ 0.8

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Pythagorean theorem Im confused on how to solve it pls help

Answers

Answer:

Part A:

[tex]d = \sqrt{ {9}^{2} + {40}^{2} } = \sqrt{81 + 1600} = \sqrt{1681} = 41[/tex]

The bat will not fit across the diagonal formed by the bottom corners of the box. That diagonal measures 41 inches, whereas the baseball bat is 41.5 inches long.

Part B:

[tex]d = \sqrt{ {9}^{2} + {9}^{2} + {40}^{2} } = \sqrt{81 + 81 + 1600} = \sqrt{1762} = 41.98[/tex]

The bat will fit across the diagonal formed by the bottom corner and the top corner of the box. That diagonal measures about 42 inches, which is slightly longer than the baseball bat's length of 41.5 inches.

Answer:

41.762 inches

Step-by-step explanation:

therefore the length of the diagonal is 41.762 in

A conditional statement is false only when the consequent is true and the antecedent is false. true or false

Answers

Answer: false

Step-by-step explanation:

True. A conditional statement consists of an antecedent (the "if" statement) and a consequent (the "then" statement). The statement is false only when the consequent is true and the antecedent is false.

In other words, for a conditional statement "if A then B," if A is false and B is true, the statement is false. If A is true and B is false or if both A and B are false, the statement is still considered true.

The given statement is incorrect. A conditional statement is false only when the antecedent is true and the consequent is false. In a conditional statement (usually written as "if P, then Q"), the antecedent (P) represents the condition, and the consequent (Q) represents the result of the condition being satisfied. The statement is considered false if the condition (antecedent) holds, but the result (consequent) does not occur.

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enter the value of 7.8 - (3/4 + 2 1/4). help-

Answers

Answer: 4.8

3/4+2 1/4= 3

7.8-3=4.8

Emma, Kyran and Polly each spun the same spinner a number of times and recorded how many times it landed on a section labelled 4. Their results are shown below. a) They each used their own results to work out the estimated probability of the spinner landing on 4. Which person had the best estimate for the probability? b) By combining all of their results, work out the estimated probability of the spinner landing on 4. Give your answer as a decimal. c) Will using the combined results give a better or worse estimate than using only one person's results? Write a sentence to explain your answer. Number of times the spinner landed on 4 Total number of spins Emma 25 70 Kyran 20 50 Polly 23 80​

Answers

Using the combined results gives a better probability estimate than using only one person's results.

What is the probability of each of them landing a 4?

The probability of each of them landing a 4 is calculated using the formula below:

Probability = Number of times the spinner landed on 4 /Total number of spins

The probability of each of them landing a 4 is given below:

Emma: 25/70 = 0.36 or 36%

Kyran: 20/50 = 0.4 or 40%

Polly: 23/80 = 0.29 or 29%

b) The combined estimated probability of the spinner landing on 4 is calculated as follows:

Total number of times spinner landed on 4 = 25 + 20 + 23 = 68

Total number of spins = 70 + 50 + 80 = 200

Combined estimated probability = 68/200

The combined estimated probability = 0.34 or 34%

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Find the equation of the line. The line is parallel to the graph of 2x-3y=7 and contains the point (-3, -3).

Answers

Step-by-step explanation:

2x-3y=7 (-3,-3)

2x-7=3y

3y=2x-7

divide both sides by 3

y = 2/3x - 7/3

m1= 2/3

m1=m2 for parallel

2/3 = y-(-3)/x-(-3)

2/3= y+3/x+3

2 = y+3

– —

3 x +3

then you cross multiply

2(x+3)=3(y+3)

2x+6= 3y+9

then move everything to one side

2x-3y+6-9 =0

2x-3y-3=0

Answer:

[tex]\textsf{Slope-intercept form:} \quad y=\dfrac{2}{3}x-1[/tex]

[tex]\textsf{Standard form:} \quad 2x-3y=3[/tex]

Step-by-step explanation:

Parallel lines have the same slope.

Therefore, in order to find the equation of the line that is parallel to 2x - 3y = 7, we must first find the slope of this line by rearranging it in the form y = mx + b.

[tex]\begin{aligned}2x-3y&=7\\2x-3y+3y&=7+3y\\2x&=3y+7\\2x-7&=3y+7-7\\2x-7&=3y\\3y&=2x-7\\\dfrac{3y}{3}&=\dfrac{2x-7}{3}\\y&=\dfrac{2}{3}x-\dfrac{7}{3}\end{aligned}[/tex]

The equation y = mx + b is the slope-intercept form of a straight line, where m is the slope and b is the y-intercept. Therefore, the slope of the line is m = 2/3.

To find the equation of the line has a slope m = 2/3 and contains the point (-3, -3), we can use the point-slope form of a straight line.

[tex]\begin{aligned}y-y_1&=m(x-x_1)\\\\\implies y-(-3)&=\dfrac{2}{3}(x-(-3))\\\\y+3&=\dfrac{2}{3}(x+3)\\\\y+3&=\dfrac{2}{3}x+2\\\\y+3-3&=\dfrac{2}{3}x+2-3\\\\y&=\dfrac{2}{3}x-1\end{aligned}[/tex]

Therefore, the equation of the line that is parallel to the graph of 2x - 3y = 7 and contains the point (-3, -3) in slope-intercept form is:

[tex]\boxed{y=\dfrac{2}{3}x-1}[/tex]

If you want the equation in standard form, rearrange the equation to Ax + By = C (where A, B and C are constants and A must be positive):

[tex]\begin{aligned}y&=\dfrac{2}{3}x-1\\\\3 \cdot y&=3 \cdot \left(\dfrac{2}{3}x-1\right)\\\\3y&=2x-3\\\\3y+3&=2x-3+3\\\\3y+3&=2x\\\\3y+3-3y&=2x-3y\\\\3&=2x-3y\\\\2x-3y&=3\end{aligned}[/tex]

Therefore, the equation of the line that is parallel to the graph of 2x - 3y = 7 and contains the point (-3, -3) in standard form is:

[tex]\boxed{2x-3y=3}[/tex]

Jennifer has been living in her current principal residence for three years. Six months ago Jennifer decided that she would like to purchase a second home near a beach so she can vacation there for part of the year. Despite her best efforts, Jennifer has been unable to find what she is looking for. Consequently, Jennifer recently decided to change plans. She purchased a parcel of land for $130,000 with the intention of building her second home on the property. To acquire the land, she borrowed $130,000 secured by the land. Jennifer would like to know whether the interest she pays on the loan (before construction on the house is completed) is deductible as mortgage interest.
a. How should Jennifer treat the interest if she has begun construction on the home and plans to live in the home in 12 months from the time construction began?
Interest is b. How should Jennifer treat the interest if she hasn’t begun construction on the home but plans to live in the home in 15 months?
Interest is c. How should Jennifer treat the interest if she has begun construction on the home but doesn’t plan to live in the home for 37 months from the time construction began?
Interest is

Answers

a. If Jennifer has begun construction on the home and plans to live in it in 12 months from the time construction began, the interest she pays on the loan can be treated as deductible mortgage interest.

This is because the IRS allows interest on loans for the construction or purchase of a second home to be deductible if the home will be used as a qualified residence within 24 months.

b. If Jennifer hasn't begun construction on the home but plans to live in it in 15 months, the interest she pays on the loan can still be treated as deductible mortgage interest. As long as she starts construction and completes it within 24 months, making the home a qualified residence, the interest remains deductible.

c. If Jennifer has begun construction on the home but doesn't plan to live in it for 37 months from the time construction began, the interest on the loan is not deductible as mortgage interest. This is because the home won't be used as a qualified residence within the 24-month time frame allowed by the IRS.

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Isabella gave the cashier $30 to pay for 5 pairs of socks. The cashier gave her $7. 20 in
change. Each pair of socks cost the same amount

Answers

The cost of each pair of socks is $1.14 if Isabella paid $30 and gets $7.20 as a change for 5 pairs of socks.

The cost of 5 pairs of socks is given by the change she receives when subtracted from the total amount she paid.

Amount paid = $30

Change = $7.20

Cost of 5 pairs of socks = Amount paid - change

= 30 - 7.20

= $22.80

The cost of one pair of socks is calculated by dividing the cost of 5 pairs of socks by 5.

Cost of one pair of socks = 22.80 ÷ 5

= $ 1.14

Thus, the cost of one pair of socks is $1.14

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The complete question is 'Isabella gave the cashier $30 to pay for 5 pairs of socks. The cashier gave her $7. 20 in change. Each pair of socks cost the same amount. Find the cost of a single pair of socks.'

F(x)=1/4times 5/2^x decay or growth

Answers

The function F(x)= ¹/₄(⁵/₂)ˣ , is a growth function.

What is the given function?

The given function is;

F(x)= ¹/₄(⁵/₂)ˣ

To determine if the function is growth function or decay function, we will compare it to the general form of the function.

So the given function is an exponential function of the form;

f(x) = a(b)ˣ

Where;

a = 1/4b = 5/2

Since the base (b) is greater than 1, we can conclude that function is a growth function.

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Let Yı, Y2, ..., Y. be a random sample from a distribution with probability density function given by for 0

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A random sample is a set of observations that are chosen randomly from a larger population. Each observation in the sample is independent and identically distributed (i.e. has the same underlying probability distribution).

A probability density function (PDF) is a mathematical function that describes the likelihood of a random variable taking on a particular value or range of values. It's used to model continuous random variables (as opposed to discrete random variables, which have probability mass functions).

Now, let's apply these concepts to the problem at hand.

We have a random sample Y1, Y2, ..., Yn from a distribution with the PDF:

f(y; λ) = λe^(-λy)    for y ≥ 0

where λ > 0 is a parameter of the distribution.

We want to find the maximum likelihood estimator (MLE) of λ based on this sample. The MLE is the value of the parameter that maximizes the likelihood function, which is the joint PDF of the sample.

The joint PDF of the sample is given by:

f(y1, y2, ..., yn; λ) = λ^n * e^(-λ(y1 + y2 + ... + yn))

To find the MLE of λ, we need to maximize this function with respect to λ. However, it's easier to work with the logarithm of the likelihood function, since the logarithm is a monotonic function and will preserve the location of the maximum.

Taking the logarithm of the likelihood function, we get:

log(L) = n*log(λ) - λ(y1 + y2 + ... + yn)

To maximize this function, we take the derivative with respect to λ and set it equal to zero:

d/dλ [log(L)] = n/λ - (y1 + y2 + ... + yn) = 0

Solving for λ, we get:

λ = n / (y1 + y2 + ... + yn)

This is the MLE of λ based on the sample. Note that this estimator depends on the values of the sample observations, which makes sense since the estimator is trying to capture the underlying distribution of the population based on the observed data.

To verify that this is a maximum, we can take the second derivative of the log-likelihood function with respect to λ:

d^2/dλ^2 [log(L)] = -n/λ^2 < 0

Since the second derivative is negative, this confirms that the MLE is a maximum.

So, to summarize: given a random sample Y1, Y2, ..., Yn from a distribution with the PDF f(y; λ) = λe^(-λy) for y ≥ 0, the maximum likelihood estimator of λ is λ = n / (y1 + y2 + ... + yn). This estimator captures the underlying distribution of the population based on the observed data in the sample.

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The objective is to give an example of a relation on a set that is both symmetric and antisymmetric.

Answers

A. Therefore, if (x, y) and (y, x) are in R, then x = y, which means that xRy and yRx only if x = y, which is not true for distinct elements x, y in A.

A relation R on a set A is said to be symmetric if for any elements x, y in A, if xRy, then yRx. A relation R on a set A is said to be antisymmetric if for any distinct elements x, y in A, if xRy, then it is not true that yRx.

One example of a relation on a set that is both symmetric and antisymmetric is the equality relation. Let A be any set and let R be the equality relation, defined as:

R = {(x, y) | x = y for x, y in A}

Then, R is symmetric because if x = y, then y = x for any x, y in A. Therefore, if (x, y) is in R, then (y, x) is also in R. R is also antisymmetric because if x = y and y = x, then x = y for any x, y in A. Therefore, if (x, y) and (y, x) are in R, then x = y, which means that xRy and yRx only if x = y, which is not true for distinct elements x, y in A.

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What is the median of this data set?

Answers

The median of the given data set as required to be determined in the task content is; 4.

What value represents the median of the data set?

It follows from the task content that the value which represents the median of the data set is to be determined.

By observation, the number of data values in the data set is; 15. On this note, the median value would be the eighth term in an orderly arrange of the values.

Consequently, the median of the data set as required is; 4.

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From the set {4, 7, 41}, use substitution to determine which value of x makes the equation true.

7(x + 37) = 287

Answers

There is no value of x in the set {4, 7, 41} that makes the equation 7(x + 37) = 287 true.

To solve for x, we can use substitution. We substitute 7 for x in the equation and see if both sides are equal:

7(x + 37) = 287

7(7 + 37) = 287

7(44) = 287

308 = 287

Since 308 does not equal 287, we can conclude that 7 is not the value of x that makes the equation true. We can try the other values in the set and see if they work:

4(x + 37) = 287

4(4 + 37) = 287

4(41) = 287

164 = 287

Again, 164 does not equal 287, so 4 is not the value of x that makes the equation true.

Finally, we can try the last value in the set:

41(x + 37) = 287

41(41 + 37) = 287

41(78) = 287

3198 = 287

This time, we get an equation that is not true.

Therefore, there is no value of x in the set {4, 7, 41} that makes the equation 7(x + 37) = 287 true.

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34. Name an error-detection method that can compensate for burst errors

Answers

One error-detection method that can compensate for burst errors is the cyclic redundancy check (CRC).

This method involves adding extra bits to the data being transmitted, which can detect and correct errors in the data. and has error detection. CRC is particularly effective in detecting and correcting burst errors, which occur when a group of consecutive bits are corrupted in a data transmission.

An error-detection method that can compensate for burst errors is the "Reed-Solomon code". Reed-Solomon codes are block-based error correcting codes that can detect and correct multiple errors in data transmissions, making them highly effective in handling burst errors. These codes compensate for burst errors by using redundant information added to the original data, allowing the receiver to accurately reconstruct the original data even in the presence of errors.

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suppose a problem asks for the probability of at most four successes when there are only five trials. which one of these expressions would provide the answer?

Answers

The sum of all these probabilities is equal to 1, which is the total probability of all possible outcomes.

To solve this problem, we need to consider all the possible outcomes that result in at most four successes. These outcomes are:

0 successes

1 success

2 successes

3 successes

4 successes

The probability of each of these outcomes can be calculated using the binomial distribution formula:

P(k) = (n choose k) [tex]* p^k * (1-p)^(n-k)[/tex]

where n is the number of trials, k is the number of successes, and (n choose k) is the binomial coefficient, which is equal to n!/(k!*(n-k)!).

To find the probability of at most four successes, we need to add up the probabilities of all these outcomes. So the expression that would provide the answer is:

P(0 successes) + P(1 success) + P(2 successes) + P(3 successes) + P(4 successes)

This expression includes all the possible outcomes that correspond to having at most four successes in five trials. Note that it does not include the probability of having five successes, since we are only interested in the probability of at most four successes.

For example, if the probability of success in each trial is 0.3, then the probability of having zero successes is:

P(0 successes) = (5 choose 0)[tex]* 0.3^0 * 0.7^5 = 0.168[/tex]

Similarly, the probability of having one success is:

P(1 success) = (5 choose 1) [tex]* 0.3^1 * 0.7^4 = 0.360[/tex]

We can calculate the probabilities of having two, three, and four successes in a similar way. Then, we can add up all these probabilities to get the probability of at most four successes:

P(at most 4 successes) = P(0 successes) + P(1 success) + P(2 successes) + P(3 successes) + P(4 successes)

In this example, we get:

P(at most 4 successes) = 0.168 + 0.360 + 0.308 + 0.132 + 0.032 = 1.000

Note that the sum of all these probabilities is equal to 1, which is the total probability of all possible outcomes.

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A summary of two stocks is shown.


Name of Stock Symbol Closing Price Day 1 Closing Price Day 2 Closing Price Day 3
Metroplis, Ltd MTP 17.95 18.28 18.25
Suburbia, Inc SBR 5.63 5.88 4.98


Suppose you purchase 30 shares of Metropolis stock and 55 shares of Suburbia stock on Day 1 at the closing price. Which day, during the following two days, would be the best to sell both stocks?
Day 2 is the best by $26.75.
Day 3 is the best by $26.75.
Day 2 is the best by $23.65.
Day 3 is the best by $23.65.

Answers

The solution is,  the unique price of the proportion is $10.37 even as within the promotion it is promoting at $18.25 consequently, The inventory is over-valued.

We have,

The following market and stock-specific statistics  10.37201

anticipated Return on company Y = Rf + Beta(Rm-Rf)

= zero.029+ 1.forty one*(zero.082)

= zero.14462

charge of the stock =Dividend/predicted to go back

= 1. 5/0.14462

= 10.37201

So the unique price of the proportion is $10.37 even as within the promotion it is promoting at $18.25 consequently, The inventory is over-valued.

A market is described as the sum overall of all the consumers and dealers in the region or place under attention. The vicinity may be the earth, nations, regions, states, or towns. The fee, fee, and fee of items traded are according to forces of delivery and demand in a marketplace.

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complete question:

use the following market and stock specific information to answer this question. assume you create your own portfolio made up of the four individual stocks shown below. the weighting of the porfolio is 30% stock w, 20% stock x, 20% stock y and 30% stock z. if a treasury bill currently sells for $970.05 and if firm y is expected to pay a constant annual dividend of $1.50 per share, and if the stock is currently selling for $18.25 per share, what is your opinion of the stock price?

URGENT The volume of the triangular block is 4 cubic inches.What is the approximate length of y? Round to the nearest tenth of an inch

Answers

When the volume of the triangular block is 4 cubic inches, the approximate length of y is 2.8 inches.

How to calculate the volume

volume = 1/2 x A x C x H = 4 cubic inches

Because the volume of the triangular block is 4 cubic inches.

Formula:

A x C = Base x Height

= 2.8 inches will be the approximate lenght of the y.

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What is the pooled variance for the following two samples? Sample 1: n = 6 and SS = 56 Sample 2: n = 4 and SS = 40 a.9.6 b.12 c.5 d.Ö5

Answers

The pooled variance is calculated by combining the sum of squares (SS) and the degrees of freedom from two samples. Here are the steps to calculate the pooled variance:

1. Calculate the degrees of freedom for each sample (df1 = n1 - 1 and df2 = n2 - 1)
2. Calculate the pooled sum of squares (PSS = SS1 + SS2)
3. Calculate the pooled degrees of freedom (PDF = df1 + df2)
4. Calculate the pooled variance (PV = PSS / PDF)

For your samples:

Sample 1: n1 = 6, SS1 = 56, df1 = n1 - 1 = 5
Sample 2: n2 = 4, SS2 = 40, df2 = n2 - 1 = 3

Now, let's compute the pooled variance:

PSS = SS1 + SS2 = 56 + 40 = 96
PDF = df1 + df2 = 5 + 3 = 8
PV = PSS / PDF = 96 / 8 = 12

So, the pooled variance for the given samples is 12, which corresponds to answer choice (b).

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a ratio is the relationship between two quantities, such as the two adjacent sides of a ractangle. somethimes these are expressed as

Answers

A ratio is essentially a comparison of two quantities, often expressed as a fraction or using the colon symbol.

For example, the ratio of the length to the width of a rectangle could be expressed as "length:width" or "length/width". The terms "numerator" and "denominator" are also used in ratios, with the numerator representing the first quantity being compared and the denominator representing the second quantity being compared. Ratios can be simplified, multiplied, or divided just like fractions.
A ratio is the relationship between two quantities, such as the two adjacent sides of a rectangle. Ratios can be expressed in various ways, including using a colon (e.g., 3:4) or as a fraction (e.g., 3/4). These expressions help compare the relative sizes of the two quantities involved.

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A tower 22 meters tall casts a shadow of 33m along the level ground. At what angle do the rays of the sun hit the ground

Answers

Based on the mentioned informations and provided values, the angle at which the sun's rays hit the ground is calculated to be approximately 35.87 degrees.

We can use the concept of trigonometry to solve this problem. Let's suppose A represents the top of the tower, B represents the bottom of the tower, and the line connecting A and B represents the shadow cast by the tower. Let's assume that the angle between the sun's rays and the ground is θ.

We can use the tangent function to relate the angle θ to the dimensions of the triangle ABP:

tan(θ) = opposite / adjacent = AB / BP

We know that AB = 22 and BP = 33, so:

tan(θ) = 22/33

Taking the arctangent of both sides, we get:

θ = arctan(22/33)

Using a calculator, we find:

θ ≈ 35.87°

Therefore, the angle at which the sun's rays hit the ground is approximately 35.87 degrees.

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when using predictive analytics models, it is important to have a sufficient number of records to insure that stable results can be achieved. (the absolute minimum recommended is 10 observations (rows) per predictor (column) in the training data set.) a predictive study was planned with 20 predictor variables. the analyst planned to create training, validation, and testing sets with the following proportions: 50% training; 30% validation; and 20% testing. what is the total minimum number of records that should be available for this study?

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Based on the recommendation of having at least 10 observations per predictor in the training data set, with 20 predictor variables based on the 10 observations per predictor rule:20 predictor variables * 10 observations per predictor = 200 records for the training set.

In this study, the minimum number of records needed for the training set  alone would be 200 (10 x 20).

If the training set is planned to be 50% of the total data, then the total minimum number of records needed for the entire study would be 400 (200 / 0.5). To break it down further, the validation set would require a minimum of 120 records (10 x 20 x 0.3 = 120) and the testing set would require a minimum of 80 records (10 x 20 x 0.2 = 80).
Therefore, the total minimum number of records needed for this study would be 400 (200 for training + 120 for validation + 80 for testing).

Since the training set represents 50% of the total data, we can use this information to calculate the total number of records needed for the entire study:200 records (training set) / 0.5 (50% proportion of training set) = 400 total records

Therefore, a minimum of 400 records should be available for this study to ensure stable results in the predictive analytics model with 20 predictor variables.

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(15 POINTS) HELP ASAPPPP PLSSSS

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C, D, E are correct.

How do you evaluate positive integers that have been raised to a negative power?

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When a positive integer is raised to a negative power, we can evaluate it by taking the reciprocal of the positive integer raised to the absolute value of the negative power.

if we have a positive integer a raised to a negative power n, we can evaluate it as:

a^(-n) = 1 / a^n

For example, if we have 2^(-3), we can evaluate it as:

2^(-3) = 1 / 2^3 = 1/8

Similarly, if we have 5^(-2), we can evaluate it as:

5^(-2) = 1 / 5^2 = 1/25

Note that this rule applies only to positive integers raised to negative powers. When we have negative numbers raised to negative powers or fractions raised to negative powers, we need to use different rules for evaluation

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Write t+4/t+5 and 9/t-1 with a common denominator

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The sum of t+4/t+5 and 9/t-1 with a common denominator is (t²+12t+41)/[(t+5)(t-1)].

To find a common denominator for the given expressions t+4/t+5 and 9/t-1, we need to determine the least common multiple (LCM) of the denominators (t+5) and (t-1):

The prime factorization of t+5 is (t+5).

The prime factorization of t-1 is (t-1).

Therefore, the LCM is (t+5)(t-1).

To convert t+4/t+5 into an equivalent fraction with the denominator (t+5)(t-1), we multiply both the numerator and denominator by (t-1):

t+4/t+5 = (t+4)(t-1)/[(t+5)(t-1)] = (t²+3t-4)/[(t+5)(t-1)]

To convert 9/t-1 into an equivalent fraction with the denominator (t+5)(t-1), we multiply both the numerator and denominator by (t+5):

9/t-1 = 9(t+5)/[(t+5)(t-1)] = (9t+45)/[(t+5)(t-1)]

Now both fractions have the same denominator, so we can add them:

(t²+3t-4)/[(t+5)(t-1)] + (9t+45)/[(t+5)(t-1)] = (t²+3t-4+9t+45)/[(t+5)(t-1)]

Simplifying the numerator gives:

t²+12t+41

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2x^2-2x+1=4x+1 Factoring (Answers are exact)

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The requried factored form of the expression 2x^2-2x+1-4x-1 is 2x(x-3/2).

Here,
To factor the expression [tex]2x^2-2x+1-4x-1[/tex], we can rearrange the terms to get:

[tex]2x^2 - 6x = 0[/tex]

Now we can factor out the common factor of 2x to get:

2x(x-3) = 0

So the solutions are:

x = 0, x = 3/2

Therefore, the factored form of the expression 2x^2-2x+1-4x-1 is 2x(x-3/2).

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Ingrid has 14.4 meters of string to hang 5 pennants and a banner at her school. She needs 0.65 meter of string for the banner and the same length string for each pennant. What length of string will be used to hang each pennant? Write and solve a two-step equation. Let s represent the length of string used to hang each pennant.

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Answer:

5s + 0.65 = 14.4

      - 0.65  - 0.65

______________

5s = 13.75

___.   ___

5          5

s = 2.75 meters of string for each pennant

Explanation:

s represents the length of string required for each pennant.

We know that Ingrid is using a total of 14.4 meters of string to hang a banner and 5 pennants.

We also know that out of that 14.4 meters, 0.65 meters is used to hang the banner. The rest of the string left is equally distributed among the 5 pennants.

So, therefore, we have a constant of 0.65 and a coefficient of 5 with variable, s.

Next, we solve this by first isolating the constant by subtracting 0.65 on both sides.

Then. we isolate the variable by dividing 5 into both sides.

So, s = 2.75 meters of string for each pennant

 

A marketing firm surveyed 300 homes in Claiborne County and found that 135 homes can access the Internet. How many of the 45,000 homes in Claiborne County would you expect to be able to access the Internet?

Answers

We can use proportions to estimate the number of homes in Claiborne County that can access the Internet based on the survey results.

If 135 out of 300 homes surveyed can access the Internet, then the proportion of homes in Claiborne County that can access the Internet can be estimated as:

135/300 = x/45000

where x is the number of homes in Claiborne County that can access the Internet.

Solving for x, we get:

x = (135/300) * 45000 = 20,250

Therefore, we would expect approximately 20,250 homes in Claiborne County to be able to access the Internet based on the survey results. Note that this is just an estimate, and the actual number of homes in Claiborne County that can access the Internet may be different.

A statistician wants to find the probability that a z score is between 1 and 2.5. Which of these functions gives the probability? Not enough information - the n is not given. =NORM.DIST(2.5 - 1,0, 1, FALSE) =NORM.DIST(2.5 - 1.0, 1. TRUE) =NORM.DIST(2.5, 0, 1, TRUE) - NORM.DIST(1, 0, 1, TRUE) Not enough information - the mean and standard deviation are not given. =NORM.DIST(2.5, 0.1, TRUE) + NORM.DIST(1, 0, 1, TRUE)

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The correct function to find the probability that a z score is between 1 and 2.5 is =NORM.DIST(2.5, 0, 1, TRUE) - NORM.DIST(1, 0, 1, TRUE). This function calculates the cumulative probability for each z score and subtracts the lower value (1) from the higher value (2.5) to find the probability between them.

The function that gives the probability that a z score is between 1 and 2.5 is =NORM.DIST(2.5, 0, 1, TRUE) - NORM.DIST(1, 0, 1, TRUE). This function calculates the area under the standard normal distribution curve between the z scores of 1 and 2.5. The statistician can use this function to determine the likelihood of a random variable falling within this range of z scores. The standard normal distribution has a mean of 0 and a standard deviation of 1, which is why these values are used in the function.

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Explain in your own words what the distributive law is. ​

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Answer: What is a Distributive Law?

Step-by-step explanation:

Distributive law, also called distributive property, in mathematics, the law relating the operations of multiplication and addition, stated symbolically as a(b + c) = ab + ac; that is, the monomial factor a is distributed, or separately applied, to each term of the binomial factor b + c, resulting in the product ab + ac. From this law it is easy to show that the result of first adding several numbers and then multiplying the sum by some number is the same as first multiplying each separately by the number and then adding the products.

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Multiplying a number by a group of numbers adding together is called distructive law

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