AEFD - AEIH by the SSS similarity theorem. Which ratio is also equal to
EF
EI
- and ED/EH

Answer:

The numbers are -3, -2, and -1.

Step-by-step explanation:

Since -2 and -1 add up to -3, and -3+-3 = -6, and since the numbers are next to each other on your number line, well, then you got your answer. Here's how:

-3+-2+-1=-6

Answer:

w = 3; w = 4

Step-by-step explanation:

We can start by expanding the equation on the left hand side:

[tex](w+5)^2=2w^2+3w+37\\(w+5)(w+5)=2w^2+3w+37\\w^2+5w+5w+25=2w^2+3w+37\\w^2+10w+25=2w^2+3w+37[/tex]

We can first simplify the equation subtracting all the terms on the right hand side and having the equation equal 0:

[tex]w^2+10w+25=2w^2+3w+37\\(w^2-2w^2)+(10w-3w)+(25-37)=0\\-w^2+7w-12=0[/tex]

Now, we have one equation in standard form (ax^2 + bx + c = 0).

We can solve this equation using the quadratic equation which is

[tex]x = \frac{-b+\sqrt{b^2-4ac} }{2a} \\\\x=\frac{-b-\sqrt{b^2-4ac} }{2a}[/tex]

Since -1 is our a value, 7 is our b, and -12 is c, we simply plug in our values and solve for x:

First x:

[tex]x=\frac{-7+\sqrt{7^2-4(-1)(-12)} }{2(-1)}\\ \\x=\frac{-7+\sqrt{1} }{-2}\\ \\x=\frac{-7+1}{-2}\\ \\x=\frac{-6}{-2}\\ \\x=3[/tex]

Second x:

[tex]x=\frac{-7-\sqrt{7^2-4(-1)(-12)} }{2(-1)}\\ \\x=\frac{-7-\sqrt{1} }{-2}\\ \\x=\frac{-7-1}{-2}\\ \\x=\frac{-8}{-2}\\ \\x=4[/tex]

Finally, we must check for extraneous solutions, which (if present) will make the equations not true.  We simply plug in 3 for w and 4 for w to check for such solutions:

Checking 3:

[tex](3+5)^2=2(3)^2+3(3)+37\\8^2=2(9)+9+37\\64=18+9+37\\64=64[/tex]

Checking 4:

[tex](4+5)^2=2(4)^2+3(4)+37\\9^2=2(16)+12+37\\81=32+12+37\\81=81[/tex]

Since the equations are true for both 3 and 4, both values work for w.

Answer:

use the l.c.m and use formula of two square.cut + and+ or - and -

Answer:

Step-by-step explanation:

[tex]\frac{3x+4}{x+2}+ \frac{x^{2}+2x}{2x+4}\\\frac{2(3x+4)+x(x+2)}{2(x+2)}==\frac{x^{2}+8x+8}{2(x+2)}[/tex]

The ordered pair that could replace the missing ordered pair to make the set not a function is given as follows:

(−7, 15).

A set of ordered pairs represents a function if every input (first component of the ordered pair) is associated with exactly one output (second component of the ordered pair). In other words, if no two ordered pairs in the set have the same first component but different second components.

Hence the ordered pair (-7,15) would make the relation not a function, as the set already has the ordered pair (-7,-15), in which the input 7 is already mapped to an output of -15, hence it cannot be mapped to an output of 15.

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The value of the sum from n = 2 to n = 6 of 4n + 5 is given as follows:

b. 105.

To obtain the numeric value of a function or of an expression, we substitute each instance of any variable or unknown on the function by the value at which we want to find the numeric value of the function or of the expression.

The expression of this problem is given as follows:

4n + 5.

The sum is the sum of the numeric values from n = 2 to n = 6, hence:

Hence the sum has the result given as follows:

13 + 17 + 21 + 25 + 29 = 105.

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the οther simplest fοrm οf the given expressiοn is =-8x+5y+7z-9.

Pοlynοmials are expressiοns that use variables and cοefficients in algebra. Sοmetimes when describing variables, the term "indeterminates" is used. The wοrds "pοlynοmial" and "nοminal" cοllectively denοte "many" and "terms," and they are used tο fοrm this wοrd.

A pοlynοmial is the end prοduct οf the additiοn, subtractiοn, multiplicatiοn, and divisiοn οf expοnents, cοnstants, and variables (Nο divisiοn οperatiοn by a variable). Accοrding οn hοw many terms the expressiοn cοntains, it is classified as a mοnοmial, binοmial, οr trinοmial.

The expressiοn is 8x-5y-7z+9

Sο if yοu want tο change that multiple by -ve

-8x+5y+7z-9.

Hence the οther simplest fοrm οf the given expressiοn is =-8x+5y+7z-9.

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Answer: 38 degrees

Step-by-step explanation: 90+52+x=180

180-142=38

x=38

Pearson correlation coefficient r for the data is approximately 0.915. Since the value is positive and close to 1, we can say that there is a strong positive correlation between the number of times the commercial is run on TV and the number of car sales.

What is expression ?

In mathematics, an expression is a combination of numbers, symbols, and operators (such as +, -, ×, ÷) that represents a value or a quantity. It can be a single number or variable, or a combination of them, and can also include functions, parentheses, and other mathematical symbols. For example, 3x + 7 is an expression, where 3 and 7 are constants, x is a variable, and + is an operator. Expressions can be simplified, evaluated, or used as part of a larger mathematical statement or equation.

We can use the formula for Pearson correlation coefficient r to calculate it for the given data:

r = (nΣXY - ΣXΣY) / sqrt[(nΣX² - (ΣX)²)(nΣY² - (ΣY)²)]

where n is the number of observations, Σ represents the sum of the indicated values, and X and Y represent the two variables being correlated. Using the data from the table, we can calculate the following:

n = 5

ΣX = 25, ΣY = 25.8

ΣX² = 275, ΣY² = 288.68

ΣXY = 139.2

Substituting these values into the formula, we get:

[tex]$r = (5 * 139.2 - 25 * 25.8) \sqrt{[(5 * 275 - 25^2)(5 * 288.68 - 25.8^2)]} $[/tex]

r ≈ 0.915

Therefore, the Pearson correlation coefficient r for the data is approximately 0.915. Since the value is positive and close to 1, we can say that there is a strong positive correlation between the number of times the commercial is run on TV and the number of car sales.

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Answer:

a. To find the probability that there are some lefties among the 5 people, we need to find the probability of the complement event, which is that there are no lefties among the 5 people. The probability of an individual being right-handed is 1 - 0.58 = 0.42. Therefore, the probability of none of the 5 people being left-handed is:

P(no lefties) = 0.42^5 = 0.0070 (rounded to four decimal places)

The probability of there being some lefties (≥ 1) is the complement of this:

P(some lefties) = 1 - P(no lefties) = 1 - 0.0070 = 0.9930 (rounded to four decimal places)

Therefore, the probability of there being some lefties among the 5 people is 0.9930.

b. To find the probability of there being exactly 3 lefties in the group, we can use the binomial probability formula:

P(exactly 3 lefties) = (5 choose 3) * (0.58)^3 * (0.42)^2

where (5 choose 3) = 10 is the number of ways to choose 3 people out of 5. Plugging in the values, we get:

P(exactly 3 lefties) = 10 * 0.58^3 * 0.42^2 = 0.3383 (rounded to four decimal places)

Therefore, the probability of there being exactly 3 lefties among the 5 people is 0.3383.

c. To find the probability of there being at least 4 lefties in the group, we can use the binomial probability formula again:

P(at least 4 lefties) = P(4 lefties) + P(5 lefties)

P(4 lefties) = (5 choose 4) * (0.58)^4 * (0.42)^1 = 0.2684

P(5 lefties) = (5 choose 5) * (0.58)^5 * (0.42)^0 = 0.1037

Adding these probabilities, we get:

P(at least 4 lefties) = 0.2684 + 0.1037 = 0.3721 (rounded to four decimal places)

Therefore, the probability of there being at least 4 lefties among the 5 people is 0.3721.

d. To find the probability of there being no more than 2 lefties in the group, we can use the binomial probability formula again:

P(no more than 2 lefties) = P(0 lefties) + P(1 lefty) + P(2 lefties)

P(0 lefties) = (5 choose 0) * (0.58)^0 * (0.42)^5 = 0.0022

P(1 lefty) = (5 choose 1) * (0.58)^1 * (0.42)^4 = 0.0344

P(2 lefties) = (5 choose 2) * (0.58)^2 * (0.42)^3 = 0.1866

Adding these probabilities, we get:

P(no more than 2 lefties) = 0.0022 + 0.0344 + 0.1866 = 0.2232 (rounded to four decimal places)

Therefore, the probability of there being no more than 2 lefties among the 5 people is 0.2232.

Step-by-step explanation:

The ratio as decimal is sin C = AB/BC = 8/17 = 0.4706. cos C = AC/BC = 15/17 = 0.8824 tan B = AB/AC = 8/15 = 0.5333. tan C = AB/AC = 8/15 = 0.5333. cos B = BC/AC = 17/15 = 1.1333. sin B = AC/BC = 15/17 = 0.8824.

The origin (0, 0) of a coordinate plane serves as the center of the unit circle, which has a radius of 1. It is used in trigonometry to provide the values of trigonometric functions for angles of any measure, including sine, cosine, and tangent. The x-coordinate and y-coordinate of each point on the unit circle correspond to the cosine and sine values, respectively, for that point's specific angle measure. The unit circle is a popular visual tool for teaching students about the characteristics and behaviour of trigonometric functions.

Using the right triangle we have:

sin C = opposite/hypotenuse = AB/BC = 8/17 = 0.4706

cos C = adjacent/hypotenuse = AC/BC = 15/17 = 0.8824

tan B = opposite/adjacent = AB/AC = 8/15 = 0.5333

tan C = opposite/adjacent = AB/AC = 8/15 = 0.5333

cos B = adjacent/hypotenuse = BC/AC = 17/15 = 1.1333

sin B = opposite/hypotenuse = AC/BC = 15/17 = 0.8824

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The perimeter οf Shape is 286.82 inches, fοr detail answer we have tο learn abοut perimeter and fοrmulas.

Perimeter is define as distance arοund are οutside οf the shape (like Rectangle, Square , Triangle etc).

Perimeter οf Equilateral Triangle = [tex]\frac{\sqrt{3} }{4}[/tex] side²

Here Side = 24 inch

Sο, Perimeter οf Equilateral Triangle = [tex]\frac{\sqrt{3} }{4}[/tex] × 24²

=  [tex]\frac{\sqrt{3} }{4}[/tex] × 24 × 24

= √3 × 24 × 6

= 249.41 inches

Perimeter οr Circumference οf Semi-Circle = πr + 2r

But here Perimeter = πr ( Since the base οf Semi Circle is Cοunted in Perimeter οf Equilateral Triangle)

3.14 × 12

= 37.68 inches

Sο, the perimeter οf Shape

= 249.41 + 37.68

= 286.82 inches

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Answer:

Step-by-step explanation:

According to the Sampling Theorem, the minimum sampling rate required is at least twice the highest frequency component in the signal. In this case, the highest frequency component is 8.75 kHz, so the minimum sampling rate required is:

2 x 8.75 kHz = 17.5 kHz

Therefore, the minimum sampling rate required to avoid aliasing is 17.5 kHz.

To determine the resulting sensor output bitrate in kbps, we need to calculate the number of bits per sample. Since the signal is quantised into 512 levels, we need at least 9 bits per sample to represent all possible levels (2^9 = 512).

The sensor output bitrate is the product of the sampling rate and the number of bits per sample. Using the minimum sampling rate of 17.5 kHz and 9 bits per sample, we get:

bitrate = 17.5 kHz x 9 bits/sample = 157.5 kbps

Expressing the result in scientific notation to one decimal place, we get:

bitrate = 1.6 x 10^5 kbps

Answer: the rate of heat flow through the wall when the inside air temperature is 68 °F and the outside temperature is 5 °F is 257.42 BTU per hour.

Step-by-step explanation: The rate of heat flow through the wall can be found using the formula:

Rate of heat flow = (Temperature difference) / (Effective R-value)

The temperature difference is the difference between the inside and outside temperatures, which is:

Temperature difference = (68°F) - (5°F) = 63°F

The effective R-value of the wall is given as 15.5.

To calculate the total area of the wall, we first need to find the area of the window, which is:

Area of window = (width) x (height) = (5 ft) x (3.5 ft) = 17.5 square feet

The area of the wall without the window is:

Area of wall = (length) x (height) - Area of window

Area of wall = (14 ft) x (8 ft) - 17.5 square feet

Area of wall = 105.5 square feet

So, the rate of heat flow through the wall is:

Rate of heat flow = (Temperature difference) / (Effective R-value) x (Total area of the wall)

Rate of heat flow = (63°F) / (15.5) x (105.5 square feet)

Rate of heat flow = 257.42 BTU per hour

Answer:

Please mark as brainliest

Step-by-step explanation:

Medical tax credit rates and rebates are determined by the South African Revenue Service (SARS) and are subject to change from year to year. Therefore, I cannot provide you with a copy of the medical tax credit rates and rebates for the entire period of 2013 to 2023.

However, I can provide you with the following information:

The medical tax credit rate for the 2021/2022 tax year is R319 per month for the main member and the first dependent, and R215 per month for each additional dependent.

The medical tax credit rate for the 2020/2021 tax year was R310 per month for the main member and the first dependent, and R209 per month for each additional dependent.

The medical tax credit rate for the 2019/2020 tax year was R310 per month for the main member and the first dependent, and R209 per month for each additional dependent.

The medical tax credit rate for the 2018/2019 tax year was R303 per month for the main member and the first dependent, and R204 per month for each additional dependent.

The medical tax credit rate for the 2017/2018 tax year was R286 per month for the main member and the first dependent, and R192 per month for each additional dependent.

The medical tax credit rate for the 2016/2017 tax year was R286 per month for the main member and the first dependent, and R192 per month for each additional dependent.

The medical tax credit rate for the 2015/2016 tax year was R270 per month for the main member and the first dependent, and R181 per month for each additional dependent.

The medical tax credit rate for the 2014/2015 tax year was R257 per month for the main member and the first dependent, and R172 per month for each additional dependent.

As for rebates, I should note that the South African tax system works with a system of tax brackets, where the amount of tax you pay increases as your income increases. Tax rebates are a form of tax relief that is subtracted from the amount of tax you owe. The rebate amount changes annually, and for the 2021/2022 tax year, the rebate for individuals under 65 years of age is R15,714.

Again, it is important to note that these rates and rebates are subject to change from year to year, and it is recommended that you consult with a qualified tax professional for the most up-to-date information.

Answer:

Step-by-step explanation:

help with both of these!

What is the part in the equation “45 is 15% of what number”?

They have different y-intercepts but the same end behavior. Thus, option A is correct.

A step functiοn is  mathematical functiοn that takes οn finite number οf cοnstant values οver intervals οf its dοmain. It is alsο knοwn as staircase functiοn οr  piecewise cοnstant functiοn. The cοnstant values that  functiοn takes οn are οften referred tο as  "steps" οf the functiοn.

Tο graph the step functiοn, yοu wοuld start by drawing a cοοrdinate plane with the hοrizοntal axis ranging frοm -5 tο 5 and the vertical axis ranging frοm -2 tο 2. Then, yοu wοuld plοt the pοints (-5,-1), (-4,-1), (-3,0), (-2,1), (-1,1), (0,0), (1,1), (2,-1), (3,-1), (4,0), and (5,1) οn the graph.

They have different y-intercepts but the same end behavior.

They have different y-intercepts because function f(x) is 4, while the y-intercept on graph is 6

But they have the same end behavior at 2.

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Complete question:

Function g is represented by the equation.

[tex]\rm g(x) = 4 (\frac14)^x + 2[/tex]

Which statement correctly compares the two functions?

A. they have different Y-intercepts but the same end behavior

B. they have the same Y-intercept and the same end behavior

C. they have the same Y-intercept but different end behavior

D. they have different Y-intercepts and different end behavior

Answer:

Step-by-step explanation:

There are two features of a function, domain and range. Domain corresponds to the set of x-values, while range corresponds to the set of y-values. The set of y-values corresponding to this function would be

-7 [tex]<[/tex] y [tex]\leq \\ \\[/tex] 2. It can also be written in interval notation as (-7,2] where the parentheses is inclusive of -7 and the square bracket is inclusive of 2.

know that domain means x-axis values and range means y-axis values. So for your question, we need to determine all the y values of the function which is from 3 to (-7), but to express this algebraically, we need to express it in the manner, 'x<y<z'. For your condition it would be, '-7 < y < 3' (no symbols intended with the '<' and the '3'). Be careful that I arranged '-7' and '3' so that 'y' is less than '3', but is greater '-7'. So for example, 3<y<-7 would be incorrect since you are saying that 'y' is less than '-7' and greater than '-3' which is a whole other parabola. I also chose y to represent the y-axis and range since if we used x, it would refer and confuse to/with the x-axis and domain.

The point is where the parabola's vertex is (2, -5).

Hence, the axis of symmetry is x = 2, and the vertex is (2, -5).

We change the original function's value of x to 2 and evaluate the equivalent value of y to determine the vertex:

[tex]f(2) = 0.5(2)^2 - 2(2) - 2[/tex]

= 1 - 4 - 2

= -5

A balanced and proportionate likeness between an object's two halves is referred to as symmetry in geometry. It implies that one half is the other's mirror image. The term "line of symmetry" refers to the fictitious axis or line that can be used to fold a figure into symmetrical halves.

A symmetrical object is one that is equal on both sides. Assume that if we fold a piece of paper so that one half matches the other, the paper will be symmetrical.

from the question:

The fact that the axis of symmetry goes through the vertex of a parabola can be used to determine the axis of symmetry and vertex of the function [tex]f(2) = 0.5(2)^2 - 2(2) - 2[/tex]

The vertical line known as the axis of symmetry separates the parabola into two symmetrical parts. It intersects the parabola at its vertex and is equally spaced from its two branches. The following is the equation for the axis of symmetry:

x = -b/2a

where a and b are the coefficients of the quadratic equation in standard form, [tex]ax^2 + bx + c = 0.[/tex]

In this case, a = 0.5 and b = -2, so the equation of the axis of symmetry is:

x = -(-2)/(2*0.5) = 2

Hence, a vertical line going through x = 2 serves as the axis of symmetry.

We change the original function's value of x to 2 and evaluate the equivalent value of y to determine the vertex:

[tex]f(2) = 0.5(2)^2 - 2(2) - 2[/tex]

= 1 - 4 - 2

= -5

Thus, the point is where the parabola's vertex is located (2, -5).

the axis of symmetry is x = 2

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Answer:

a. Using a standard normal table or calculator, we find that z = -1.28 satisfies P(z≤zo) = 0.0981.

b. Since the standard normal distribution is symmetric, P(-Zo≤z≤zo) = 0.99 is equivalent to P(z≤-zo) = 0.005. Using a standard normal table or calculator, we find that z = -2.33 satisfies this probability.

c. Since the standard normal distribution is symmetric, P(-Z₁ ≤z≤zo) = 0.95 is equivalent to P(0 ≤z≤Zo) = 0.475. Using a standard normal table or calculator, we find that z = 1.96 satisfies this probability.

d. Since the standard normal distribution is symmetric, P(-Z₁≤z≤z) = 0.8994 is equivalent to P(0≤z≤Z₁) = 0.4497. Using a standard normal table or calculator, we find that z = 2.66 satisfies this probability.

e. Since the standard normal distribution is symmetric, P(-Zo≤z≤0) = 0.5 - P(0≤z≤Zo) = 0.5 - 0.3106 = 0.1894. Using a standard normal table or calculator, we find that z = -0.84 satisfies this probability.

f. Since the standard normal distribution is symmetric, P(-3≤z≤3) = 0.998. Therefore, P(z>3 or z<-3) = 0.002.

g. P(Z<z) = 0.0014 is equivalent to P(z>-z₁) = 0.0014, where z₁ is the z-value such that P(z≤z₁) = 0.0014. Using a standard normal table or calculator, we find that z₁ = -2.96. Therefore, z > 2.96 satisfies P(Z<z) = 0.0014.

h. P(z≤z) = 0.5 + 0.0014/2 = 0.5007. Using a standard normal table or calculator, we find that z = 2.59 satisfies this probability.

Step-by-step explanation:

Answer:

a) 6

b) 38p

Step-by-step explanation:

p = pence

  = penny

£ = Sterling pound

Step I:

Make sure the unit of the currency is consistent throughout the question.

Either convert p to £ OR £ to p

Conversion rate applied:

1 £ = 100 p

∴Unit multipliers: [tex]\frac{100p}{1 Sterling Pound}[/tex] OR [tex]\frac{1 Sterling Pound}{100p}[/tex]

In the calculation steps below, the above unit multipliers will be used and arranged in such a way that it cancels out the current unit and assigns the answer with the desired unit:

Let’s convert p to £:

77p = [tex](77p)[/tex] × ( [tex]\frac{1SterlingPound}{100p}[/tex])

     = £0.77

Step II:

1 mango         =   £0.77

x mangoes    =   £5.00

Cross-multiplication is applied:

(£5.00)(1 mango) = (£0.77)(x mangoes)

x needs to be isolated and made the subject of the equation:

∴ x mangoes = [tex]\frac{(5.00)(1)}{0.77}[/tex]

   x = 6.493

a) ∴The greatest number of mangoes you can buy is 6

b) Change you should receive = £5.00 - [(£0.77)(6)]

                                                    = £5.00 - £4.62

                                                    = (£0.38) × ([tex]\frac{100p}{1 Sterling Pound}[/tex])

                                                    = 38p
                         

Answer:

slope = [tex]\frac{1}{4}[/tex]

Step-by-step explanation:

calculate the slope m using the slope formula

m = [tex]\frac{y_{2}-y_{1} }{x_{2}-x_{1} }[/tex]

with (x₁, y₁ ) = (8, - 2 ) and (x₂, y₂ ) = (4, - 3 )

m = [tex]\frac{-3-(-2)}{4-8}[/tex] = [tex]\frac{-3+2}{-4}[/tex] = [tex]\frac{-1}{-4}[/tex] = [tex]\frac{1}{4}[/tex]

The area of the shaded region equals 21.43 sq. units.

When calculating how much material is needed to cover a wooden table, how many tiles are needed to tile the floor, how much space is needed for a parking lot, how much paint is needed for the walls, etc., we employ the notion of area.

Given, A circle is circumscribed in the square,

Area of shaded region = area of square - area of circle

Area of square = Side²

= 10 × 10 = 100 sq. units,

Area of circle = Πr²

Radius = Diameter / 2

radius = 10 / 2 = 5 units

Area of circle = 22/7 × 5 × 5

= 78.57 sq. units

Area of shaded region = 100 - 78.57,

Area of shaded region = 21.43 sq. units

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Answer:

$36

Step-by-step explanation:

$90/100%=.9

100%-60%=40%

$.9 x 40%=36

After addressing the issue at hand, we can state that This is an odd result  interest because it implies that point A is on line segment BC, and thus triangle ABC is a straight line.

Marketing uses the formula return = principal + interest + hours. Interest can be assessed most easily with this method. Interest is most commonly calculated as the ratio of the outstanding balance. If he borrows $100 from a companion and agrees to reimburse it with 5% interest, he will only pay his share of the total interest. $100 (0.05) = $5. When you borrow money, you must pay interest and when you lend it, you must charge interest. Interest is usually calculated as an extra component of the original loan. This portion is known as the loan's interest.

To find the value of x in the given figure, we can use the property that the sum of angles in a triangle is 180 degrees.

We can begin by using the given information to calculate the value of angle ABC:

angle ABC = 180 - angle ABD - ACD = 180 - 35 - 58 = 87 degrees

angle ABE = angle ACD = 58 degree angle CDE = angle CBE = 35 degrees

angle BAC = 180 - angle ABC - angle ABE - angle CBE = 180 - 87 - 58 - 35 = 0 degrees

This is an odd result because it implies that point A is on line segment BC, and thus triangle ABC is a straight line.

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Answer:

To find the number of boats that should be produced to incur minimum cost, we need to find the value of x that minimizes the cost function C(x).

We can do this by taking the derivative of the cost function with respect to x, setting it equal to zero, and solving for x.

C(x) = 22000 - 40x + 0.02x^2

C'(x) = -40 + 0.04x

Setting C'(x) = 0, we get:

-40 + 0.04x = 0

0.04x = 40

x = 1000

Therefore, the number of boats that should be produced to incur minimum cost is 1000.

Step-by-step explanation:

The required Probabilities of type of blood are A) 0.029791, B) 0.328509, C) 0.671491.

A: event that a person has type A positive blood

A': event that a person does not have type A positive blood

We know that P(A) = 0.31, which means P(A') = 0.69.

A) To find the probability that all three people have type A positive blood, we use the multiplication rule for independent events:

P(A and A and A) = P(A) x P(A) x P(A) = 0.31 x 0.31 x 0.31 = 0.029791.

B) To find the probability that none of the three people have type A positive blood, we use the multiplication rule for independent events again:

P(A' and A' and A') = P(A') x P(A') x P(A') = 0.69 x 0.69 x 0.69 = 0.328509.

C) To find the probability that at least one of the three people have type A positive blood, we can use the complement rule:

P(at least one A) = 1 - P(none have A) = 1 - 0.328509 = 0.671491.

Alternatively, we could find this probability directly by considering the three possible cases where at least one person has type A positive blood:

one person has A and two do not: P(A and A' and A') x 3 = 0.31 x 0.69 x 0.69 x 3

two people have A and one does not: P(A and A and A') x 3 = 0.31 x 0.31 x 0.69 x 3

all three have A: P(A and A and A) = 0.029791

Then, we add up these probabilities:

P(at least one A) = (0.31 x 0.69 x 0.69 x 3) + (0.31 x 0.31 x 0.69 x 3) + 0.029791 = 0.671491.

D) The event of all three people having type A positive blood (0.029791) can be considered unusual because it has a low probability. If we define "unusual" as an event with probability less than or equal to 0.05, then this event meets that criterion. However, whether an event is considered unusual or not can depend on the specific context and criteria chosen.

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Complete question:

The critical points for the function are [tex]x=-\frac{3+\sqrt{7}}{2},\:x=-\frac{3-\sqrt{7}}{2}[/tex]

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

f(x) = (4x + 6)/(x² + x + 1)

The critical points are the points where the derivative of f(x) equals 0 or undefined when the function is defined

When f(x) is differentiated, we have

f'(x) = 4/(x² + x + 1) - [(2x + 1)(4x + 6)/[(x² + x + 1)²]

Set to 0 and evaluate

4/(x² + x + 1) - [(2x + 1)(4x + 6)/[(x² + x + 1)²] = 0

So, we have

[(2x + 1)(4x + 6)/[(x² + x + 1)²] = 4/(x² + x + 1)

This gives

[(2x + 1)(4x + 6)/[(x² + x + 1)] = 4

Cross multiply

(2x + 1)(4x + 6) = 4x² + 4x + 4

12x² + 12x + 4x + 6 = 4x² + 4x + 4

12x² + 12x  + 6 = 4x² + 4

Evaluate

8x² + 12x + 2 = 0

So, we have

4x² + 6x + 1 = 0

Using a graphing tool, we have

[tex]x=-\frac{3+\sqrt{7}}{2},\:x=-\frac{3-\sqrt{7}}{2}[/tex]

Hence, the critical points are [tex]x=-\frac{3+\sqrt{7}}{2},\:x=-\frac{3-\sqrt{7}}{2}[/tex]

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We know that the circumference (C) of a circle can be calculated using the formula:

C = 2πr, where r is the radius of the circle.

We are given that the circumference of the circle is 2.20 cm, so we can use this to solve for the radius (r):

C = 2πr

2.20 = 2πr

r = 2.20 / (2π)

r ≈ 0.350 cm

Therefore, the radius of the circle is approximately 0.350 cm.

To find the area (A) of the circle, we can use the formula:

A = πr^2

Substituting the value we found for r:

A = π(0.350)^2

A ≈ 0.385 cm^2

Therefore, the area of the circle is approximately 0.385 cm^2.

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Answer:

Step-by-step explanation:

Question :-

The circumference of the circle is 220 cm.

Find :

a) Radius

b) Area of the Circle

Solution :

a)

Circumference of circle = 2πr

[tex] \longrightarrow \: \: 220 = 2 \pi r \\ \\ \longrightarrow \: \: \frac{220}{2} = \pi r \\ \\ \longrightarrow \: \: 110 = \frac{22}{7} × r \\ \\ \longrightarrow \: \: r = 110 \times \frac{7}{22} \\ \\\longrightarrow \: \: r = \frac{770}{22} \\ \\ \longrightarrow \: \: r = 35 \: cm \\ [/tex]

b)

Area of circle = πr²

[tex]\longrightarrow \: \: \frac{22}{7} \times 35 \times 35 \\ \\ \longrightarrow \: \:22 \times 5 \times 35 \\ \\ \longrightarrow \: \:3850 \: {cm}^{2} \\ [/tex]

Hence,

a) Radius of circle is 35 cm.

b) Area of the Circle is 3850 cm²