what value of x would prove that EFG~ABC, then find EF

What Value Of X Would Prove That EFG~ABC, Then Find EF

Answers

Answer 1

45 is the value of EF in triangle .

What is known as a triangle?

Three vertices make up a triangle, a three-sided polygon. The angles of the triangle are formed by the connection of the three sides end to end at a single point. 180 degrees is the sum of the triangle's three angles.

                                       Having three sides, three angles, and three vertices, a triangle is triangular. A triangle's three inner angles add up to 180 degrees. The length of a triangle's two longest sides added together exceeds the length of its third side.

ΔEFG ~ ΔABC

  4x + 9/7x = 25/35

    4x + 9/7x = 5/7

     7(4x + 9) = 5 * 7x

        28x + 63 = 35x

           63 = 35x - 28x

            63 = 7x

              63/7 = x

                9 = x

EF = 4x + 9

      = 4 * 9 + 9

       = 36 + 9

       =  45

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Related Questions

oliver deposits 1,250 into an account that earns an annual interest rate of 3.5%, compound annually. What is the total amount in the account after 5 years?

Answers

To find the total amount in the account after 5 years, we can use the formula for compound interest:

A = P(1 + r/n)^(n*t)

where:

A is the total amount after t years

P is the principal amount (initial deposit)

r is the annual interest rate (as a decimal)

n is the number of times the interest is compounded per year

t is the number of years

In this case, we have:

P = 1,250

r = 0.035 (3.5% as a decimal)

n = 1 (compounded annually)

t = 5

So, substituting these values into the formula, we get:

A = 1,250(1 + 0.035/1)^(1*5)

A = 1,250(1.035)^5

A = 1,250(1.1942)

A = 1,492.75

Therefore, the total amount in the account after 5 years is $1,492.75.

what is the chi-squared component for 20-29 year olds who were distracted by their cell phones? group of answer choices 2.64 20.78 26.42 110.98

Answers

it is likely to be one of the answer choices provided, based on the overall sample size and distribution of distracted individuals across age groups.

The chi-squared component is a statistical value used to measure the degree of association between two categorical variables. In this case, we are looking for the chi-squared component for 20-29 year olds who were distracted by their cell phones.
To calculate the chi-squared component, we need to have data on the frequency of distracted 20-29 year olds and the expected frequency based on the overall sample size and the distribution of distracted individuals across age groups.
Assuming we have this data, we can use the chi-squared formula to calculate the component for this specific age group. The formula is:
chi-squared component = (observed frequency - expected frequency)^2 / expected frequency
For example, if the observed frequency of distracted 20-29 year olds is 50 and the expected frequency is 40 based on the overall distribution, the chi-squared component would be:
(50 - 40)^2 / 40 = 2.5
This value would be compared to a chi-squared distribution table to determine its statistical significance.
Without knowing the specific data for this study, we cannot provide an exact answer for the chi-squared component for 20-29 year olds who were distracted by their cell phones. However, it is likely to be one of the answer choices provided, based on the overall sample size and distribution of distracted individuals across age groups.

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A linear function passes through the point (2,5)
and has a slope of −5. What is the zero of the function?



15

−1

3

−5

Answers

The zero of the function is 3, and the linear function can be represented as y = -5x + 15. (option c).

To find the zero of the function, we need to determine where the function intersects the x-axis. The x-coordinate of any point on the x-axis is always 0. Therefore, to find the zero of the function, we need to find the value of x when y is equal to zero.

We can use the given point and slope to write the equation of the linear function in slope-intercept form as:

y = -5x + b

To find the value of b, we can substitute the x and y values of the given point (2,5) into the equation and solve for b:

5 = -5(2) + b

5 = -10 + b

b = 15

Now that we know the value of b, we can write the equation of the function as:

y = -5x + 15

To find the zero of the function, we need to set y to zero and solve for x:

0 = -5x + 15

5x = 15

x = 3

Hence the correct option is (c).

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create a variable with external linkage. name the variable x and give it the value 5.25.

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Externally linked identifiers are shared between translation units and are considered to be located at the outermost level of the program.

To create a variable with external linkage named "x" and give it the value 5.25, you would need to declare it in a header file with the keyword "extern" like so: extern double x.
An identifier implementing external linkage is visible to every translation unit.In practice, this means that you must define an identifier in a place which is visible to all, such that it has only one visible definition. It is the default linkage for globally scoped variables and functions. Thus, all instances of a particular identifier with external linkage refer to the same identifier in the program. The keyword extern implements external linkage.When we use the keyword extern, we tell the linker to look for the definition elsewhere. Thus, the declaration of an externally linked identifier does not take up any space. Extern identifiers are generally stored in initialized/uninitialized or text segment of RAM.Then, in a source file, you would define the variable and give it the value of 5.25 like this: double x = 5.25; This way, the variable "x" can be accessed and modified by other source files that include the header file where it was declared.

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the annual per capita consumption of ice cream (in pounds) in the united states can be approximated by a normal distribution with mean of 20.7 lbs and a standard deviation of 4.2 lbs. kyle estimates that 20% of the population eats more ice cream than he does. find how much ice cream kyle eats per year and in what percentile does this put kyle.

Answers

Using normal distribution, Kyle is in the 25th percentile, meaning that he eats less ice cream than 75% of the population.

Let X be the annual per capita consumption of ice cream. Then, we know that X follows a normal distribution with mean (μ) = 20.7 lbs and standard deviation (σ) = 4.2 lbs.

We need to find out how much ice cream Kyle eats per year. Let k be the amount of ice cream Kyle eats per year. Then, we can use the following formula to find k:

P(X > k) = 0.20

where P(X > k) is the probability that a randomly chosen person eats more than k pounds of ice cream per year.

We can standardize the variable X using the standard normal distribution (Z-score) as follows:

Z = (k - μ) / σ

We can then use the standard normal distribution table or calculator to find the corresponding Z-score for the probability of 0.20, which is approximately -0.84.

Substituting the values, we get:

-0.84 = (k - 20.7) / 4.2

Solving for k, we get:

k = 17.98 lbs

Therefore, Kyle eats approximately 17.98 pounds of ice cream per year.

To find in what percentile this puts Kyle, we can standardize k as we did earlier and find the corresponding percentile using the standard normal distribution table or calculator. Substituting the values, we get:

Z = (17.98 - 20.7) / 4.2 = -0.65

Using the standard normal distribution table or calculator, we can find that the percentile corresponding to a Z-score of -0.65 is approximately 25.

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please help me out with thisss

Answers

we find that only one of the choices produces a value that is within rounding distance of the exact value of c. That choice is: B. c = 6

How to solve angle ?

To solve for the missing side c in the triangle, we can use the Law of Cosines, which relates the lengths of the sides of a triangle to the cosine of one of its angles.

The formula for the Law of Cosines is:

c²= a² + b²- 2ab*cos(C)

Where a, b, and c are the lengths of the sides of the triangle, and C is the angle opposite the side c.

In this case, we know that b = 6 and C = 65°, and we need to solve for c. We also know that alpha = 5, but we don't need this information to solve for c.

Plugging in the values we know into the Law of Cosines formula, we get:

c² = a²+ b² - 2ab*cos(C)

c²= a² + 6² - 2a6*cos(65°)

We can simplify the cosine term using a calculator or a trigonometric table:

cos(65°) ≈ 0.4226

Substituting this value into the equation and solving for c, we get:

c² = a² + 6² - 2a6*cos(65°)

c²= a² + 36 - 12a*cos(65°)

c = sqrt(a² + 36 - 12a*cos(65°))

Since we don't know the value of a, we can't determine the exact value of c. However, we can use the answer choices provided to eliminate some possibilities.

If we try each of the answer choices, plugging them in for a and solving for c using the formula above, we find that only one of the choices produces a value that is within rounding distance of the exact value of c. That choice is:

B. c = 6

Therefore, the answer is B. c = 6.

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The accompanying data provide the winning distances for three separate competitions in a​ long-running international sporting event. Develop forecasting models for each of the events.Year Event A (in.) Event B (in.) Event C (in.)1896 71.371 1147.239 249.8641900 74.538 1418.873 282.9321904 70.817 1546.726 289.3061908 74.972 1609.962 295.1941912 76.369 1779.891 299.1671920 76.547 1759.209 281.3961924 78.229 1817.515 293.8451928 76.492 1862.839 304.9211932 77.634 1947.254 300.0691936 80.286 1986.882 318.0151948 78.141 2077.748 308.7621952 80.294 2166.949 298.6731956 83.242 2218.973 308.9781960 84.616 2330.234 319.0621964 85.134 2401.748 318.3841968 88.682 2550.114 350.4571972 88.077 2534.788 324.7431976 88.709 2657.989 328.5281980 93.106 2623.407 336.3961984 92.098 2621.394 336.1691988 93.447 2709.931 343.2361992 92.275 2563.914 334.1251996 93.959 2731.618 335.2422000 92.718 2728.758 336.4772004 93.303 2751.108 338.0852008 92.813 2709.739 328.5842012 94.141 2687.711 326.8312016 93.697 2692.322 329.452Develop a forecasting model for Event A. Select the correct choice below and fill in the answer box within your choice. ​(Round to three decimal places as​ needed.)Options:A. It is appropriate to include all of the​ data, seasonality is​ present, and there is a clear​ trend, so a​ Holt-Winters model may be the best option. For α=0.3​, β=0.7​, and γ=0.8​, the​ Holt-Winters additive seasonality model forecast for the next event is Ft+1=___in., and the​ Holt-Winters multiplicative seasonality model forecast for the next event is Ft+1= ___ in.B. It is not appropriate to include all the​ data, so a moving average model may be the best option. The​ two-period moving average forecast for the next event is ___​in., the​ three-period moving average forecast for the next event is ___ ​in., and the​ four-period moving average forecast for the next event is ___ in.C. It is appropriate to include all of the​ data, and there is a clear linear​ trend, but seasonality is not​ present, so a double exponential smoothing model may be the best option. For α=0.3 and β=0.7​, the double exponential smoothing model forecast for the next event is Ft+1=___in

Answers

From the following option given, option C is the best choice as based on the graph of the data for Event A, it appears that there is a clear linear trend but no seasonality.

For α=0.3 and β=0.7​, the double exponential smoothing model forecast for the next event is Ft+1= 84.8121 in

To develop a double exponential smoothing model, we can use the Holt's method, which is a variation of the simple exponential smoothing method.

Let Yt be the winning distance for Event A in year t, Ft be the forecasted winning distance for Event A in year t, and Tt be the trend factor for year t.

The initial values are:

F1 = Y1 = 71.371 (the winning distance for the first event)

T1 = Y2 - Y1 = 74.538 - 71.371 = 3.167 (the difference between the winning distances for the second and first events)

The smoothing equations are:

Ft = αYt + (1 - α)(Ft-1 + Tt-1)

Tt = β(Ft - Ft-1) + (1 - β)Tt-1

where α and β are the smoothing constants.

Using α = 0.3 and β = 0.7, we can forecast the winning distance for the next event:

F29 = 0.3(94.141) + 0.7(78.997 + 1.817)

= 28.2423 + 56.5698

= 84.8121

Hence, the forecasted winning distance for Event A in the next year is 84.8121 inches.

Therefore, Option 'C' is the correct choice.

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14. Tim's pay was $250, and Rita's pay was $370. Tim
also earned $36 per package, and Rita also earned $28
per package. How many packages will they have to
deliver to earn the same amount?

Answers

In linear equation, $1360 is packages will they have to deliver to earn the same amount.

What in mathematics is a linear equation?

An algebraic equation with simply a constant and a first-order (linear) component, such as y=mx+b, where m is the slope and b is the y-intercept, is known as a linear equation.

                     Sometimes, the aforementioned is referred to as a "linear equation of two variables," where x and y are the variables. Equations with power 1 variables are known as linear equations. axe+b = 0 is a one-variable example in which a and b are real numbers and x is the variable.

Tim's pay =  $250

Rita's pay = $370

Tim's package = $250 *  36

                         = $9000

Rita package  = $370 * 28

                      = $10360

packages will they have to deliver to earn the same amount

                              = $10360 - $9000

                             = $1360

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an urn contains 12 balls, ten of which are red. the selection of a red ball is desired and is therefore considered to be a success. if a person draws three balls from the urn, what is the probability of two successes?

Answers

the likelihood of getting two triumphs (i.e., two reddish balls) when drawing three balls from the urn is for the most part 0.1042, or 10.42%. 

To discover the likelihood of two triumphs, we'll utilize the binomial likelihood condition:

P(X = k) = (n select k) * p^k * (1 - p)^(n - k)

where:

P(X = k) is known as the likelihood of getting k triumphs

n is known as  the number of trials (in this case, drawing three balls)

k is known as  the number of triumphs we need to be had (in this case, two)

p is the likelihood of triumph on each trial (in this case, the likelihood of drawing a red ball)

To discover p, we have to calculate the degree of red balls interior the urn:

p = 10/12 = 5/6

By and by arranged to plug interior the values:

P(X = 2) = (3 select 2) * (5/6)^2 * (1 - 5/6)^(3 - 2)

= 3 * (25/36) * (1/6)

= 0.1042

In this way,

the likelihood of getting two triumphs (i.e., two reddish balls) when drawing three balls from the urn is for the most part 0.1042, or 10.42%. 

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let be the vector space ℙ3[x] of polynomials in x with degree less than 3 and be the subspace W=span{8−2x 9x^2,4x^2−9}.
a. Find a nonzero polynomial p(x) in W
b. Find a polynomial q(x) in V∖W.

Answers

we get a = 0, b = 1/9, and c = 0. Therefore, q(x) = x is not a linear combination of the basis vectors of W and is in V∖W.

a. To find a nonzero polynomial in W, we need to find constants a, b, and c such that ap1(x) + bp2(x) + cp3(x) = 0 where p1(x) = 8 - 2x, p2(x) = 9x^2, and p3(x) = 4x^2 - 9 are the basis vectors of W.

This gives us the system of equations:

8a - 9c = 0

-2a = 0

9b = 0

4c = 0

-9a = 0

The only nontrivial solution is a = c = 0 and b = 1. Therefore, a nonzero polynomial in W is q(x) = 9x^2.

b. To find a polynomial in V∖W, we can start by finding a basis for V. A basis for ℙ3[x] is {1, x, x^2, x^3}, so we need to find a polynomial that is not a linear combination of the basis vectors of W.

Let q(x) = x. We can show that q(x) is not in W by assuming the contrary, i.e., q(x) is a linear combination of p1(x), p2(x), and p3(x).

Then, there exist constants a, b, and c such that:

a(8 - 2x) + b(9x^2) + c(4x^2 - 9) = x

This gives us the system of equations:

-2a + 4c = 0

9b = 1

4c = 0

-9c = 0

Solving this system, we get a = 0, b = 1/9, and c = 0. Therefore, q(x) = x is not a linear combination of the basis vectors of W and is in V∖W.
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What are 3 equivalent ratios of 2/3? I'm just missing one answer, this it how it looks like 4:6,6:9 and the missing answer :27

Answers

The missing answer is 8:12. Here are three equivalent ratios of 2/3: 4:6 (divide 2 by 0.5 and 3 by 0.5), 6:9 (divide 2 by 0.333 and 3 by 0.333) and 8:12 (divide 2 by 0.25 and 3 by 0.25).

To track down comparable proportions of 2/3, you want to increase or separation both the numerator and denominator by a similar element. For instance, you could duplicate both by 2 to get 4/6 or separation both by 3 to get 2/3. One more method for finding identical proportions is to improve on the part to least terms and afterward duplicate both the numerator and denominator by a similar element. For this situation, 2/3 is now in least terms, so you can simply duplicate both by 2 to get 4/6 or by 4 to get 8/12. In this manner, the three identical proportions of 2/3 are 4:6, 6:9, and 8:12.

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state flags if we randomly select two state flags, with replacement, what is the probability that exactly one will have other characteristics?

Answers

The probability that exactly one will have other characteristics is 2 × (11/28 × 17/28). The correct answer is option e.

To calculate the probability that exactly one state flag will have other characteristics, we can break it down into two cases:

The first flag has other characteristics and the second flag does not.

The first flag does not have other characteristics and the second flag does.

The probability of the first case is (11/28) × (17/28), since the probability of selecting a flag with other characteristics on the first draw is 11/28, and the probability of selecting a flag without other characteristics on the second draw is 17/28 (since we are drawing with replacement, the probabilities remain the same for both draws).

Similarly, the probability of the second case is (17/28) × (11/28).

So the total probability is the sum of these two probabilities, which is:

(11/28) × (17/28) + (17/28) × (11/28) = 2 × (11/28) × (17/28) = 0.335 (rounded to three decimal places)

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The question is -

If we randomly select two state flags, with replacements, what is the probability that exactly one will have other characteristics?

a. 1/11 × 1/11

b. 2 × (11/28 × 17/27)

c. 12/28 + 17/28

d. 2 × 11/28

e. 2 × (11/28 × 17/28)

f. 11/28 × 17/28

find a · b. |a| = 80, |b| = 30, the angle between a and b is 3/4. correct: your answer is correct.

Answers

The dot product of vectors an and b is -60√2. Here the dot product of vectors an and b also |a| = 80, |b| = 30, and the angle between a and b is 3/4, you can use the following formula to find a · b:


a · b = |a| * |b| * cos(angle)
First, we need to convert the angle from 3/4 to radians, as the cosine function typically takes radians as input: angle = (3/4) * π
Now, plug the values into the formula: a · b = 80 * 30 * cos((3/4) * π)
Compute the cosine value: a · b = 80 * 30 * (-√2 / 2)
Finally, multiply the values together: a · b = -60√2
So, the dot product of vectors a and b is -60√2.

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the integers from 1 to 10, inclusive, are partitioned at random into two sets of five elements each. what is the probability that 1 and 2 are in the same set?

Answers

The probability of the event that the number 1 and 2 are separated into the same group is 0.48.

The integer from 1 to 10 are separated into 2 groups. Now, the ways of making two group out of 10 integers is,

= ¹⁰C₅

= 252.

Now, the total possible ways in which 1 and 2 will be in the same group is,

= 1 + 1 + ¹⁰C³

= 1 + 1 + 120

= 122

Now, the probability that 1 and 2 are in same group is,

= 122/252

= 0.48

So, the probability of 1 and 2 being in same group is 0.48.

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evaluate the integral. 6) 8 cos3 ∫ 4x dx

Answers

The solution of integral ∫8cos³(4x) dx is (2/3) sin(4x) + (1/9) sin(12x) + C

Using the power rule of integration and applying the chain rule, we can evaluate the integral as follows:
To solve this integral, we have to use the trigonometric identity:

cos³(x) = (1/4) (3cos(x) + cos(3x))

Rewriting the integral as:

∫ 8cos³(4x) dx = ∫ 8 [(1/4) (3cos(4x) + cos(12x))] dx

Now, integrating each term

∫ 8 [(1/4) (3cos(4x) + cos(12x))] dx

= (2/3) sin(4x) + (1/9) sin(12x) + C

Where C is the constant of the integration.

Therefore, the solution is:

∫ 8cos³(4x) dx = (2/3) sin(4x) + (1/9) sin(12x) + C

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Determine if the series
2 +2/10 +2/100 +2/1000 +2/10,000 + ⋯
Is it convergent or divergent, if it is convergent, calculate the sum.

Answers

Answer:

This is a convergent series with first term 2 and common ratio 1/10. The sum of this series is

[tex] \frac{2}{1 - \frac{1}{10} } = \frac{2}{ \frac{9}{10} } = 2 \times \frac{10}{9} = \frac{20}{9} = 2 \frac{2}{9} [/tex]

a tire company finds the lifespan for one brand of its tires is normally distributed with a mean of 47,500 miles and a standard deviation of 3,000 miles. what value represents the lowest mileage of the top 3% of the tires? use excel, and round your answer to the nearest integer.

Answers

The top 3% of the distribution corresponds to a percentile of 97%, so we can use the formula =Z.INV(0.97,0,1) in Excel to find the z-score. This gives us a z-score of 1.8808.

We can then use the formula for a z-score: Z =[tex](X - μ) / σ[/tex], where X is the value we want to find, [tex]μ[/tex] is the mean, and[tex]σ[/tex] is the standard deviation. Rearranging this formula, we get X =[tex]Z*σ + μ[/tex].

Plugging in the values we have, we get X = 1.8808 * 3,000 + 47,500, which equals approximately 53,643. We may calculate the z-score in Excel using the formula =Z.INV(0.97,0,1) because the top 3% of the range equates to a percentile of 97%. We obtain an average z-score of 1.8808 as a result.

The z-score can then be calculated using the following formula: Z = (X - ) /, when X is the value we're looking for, is the mean, and is its standard deviation. By rearranging this equation, we obtain X = Z* +. Using the information we have, we can calculate X as follows: X = 1.8808 * 3,000 + 47,500, or roughly 53,643.

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the radius of a spherical ball is increasing at a rate of 2 cmymin. at what rate is the surface area of the ball increas- ing when the radius is 8 cm?

Answers

The rate at which the surface area of the ball is increasing when the radius is 8 cm is 128π cm^2/min.

To find the rate of increase of the surface area of the ball, we need to use the formula for the surface area of a sphere, which is 4πr^2. Here, r is the radius of the sphere.
We are given that the radius of the ball is increasing at a rate of 2 cm/min. So, we can say that dr/dt = 2 cm/min. We need to find the rate at which the surface area is increasing when the radius is 8 cm. So, we need to find dA/dt when r = 8 cm.
To find dA/dt, we need to differentiate the formula for the surface area with respect to time. So, we get:
dA/dt = d/dt (4πr^2)
dA/dt = 8πr (dr/dt)
Substituting the values we know, we get:
dA/dt = 8π(8)(2)
dA/dt = 128π
So, the rate at which the surface area of the ball is increasing when the radius is 8 cm is 128π cm^2/min.
In summary, when the radius of a spherical ball is increasing at a rate of 2 cm/min, the rate at which the surface area of the ball is increasing can be found by differentiating the formula for surface area with respect to time and substituting the values we know. In this case, the rate of increase of surface area is 128π cm^2/min when the radius is 8 cm.

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Consider the instrumental variable regression model Yi = ?0 + ?1Xi + ?2Wi + ui where Zi is an instrument. Suppose that data on Wi are not available and the model is estimated omitting Wi from the regression(a) Suppose that Zi and Wi are uncorrelated. Is the IV estimator consistent?(b) Suppose that Zi and Wi are correlated. Is the IV estimator consistent?

Answers

In the instrumental variable regression model Yi = ?0 + ?1Xi + ?2Wi + ui where Zi is an instrument, the variable Wi is missing from the regression equation. The IV estimator is consistent when Zi and Wi are uncorrelated, but not consistent when Zi and Wi are correlated.

The question asks whether the IV estimator is consistent in two scenarios.
(a) If Zi and Wi are uncorrelated, then the IV estimator is consistent. This is because in this scenario, the omitted variable bias is not present. The reason for this is that the variable Wi is not correlated with the error term ui in the equation Yi = ?0 + ?1Xi + ?2Wi + ui, and hence its omission does not lead to biased estimates of ?1.
(b) However, if Zi and Wi are correlated, then the IV estimator may not be consistent. This is because the omitted variable bias is present in this scenario. The variable Wi is correlated with the error term ui in the equation Yi = ?0 + ?1Xi + ?2Wi + ui. Therefore, its omission leads to biased estimates of ?1.
In summary, the presence of correlation between Zi and Wi affects the consistency of the IV estimator. When they are uncorrelated, the IV estimator is consistent, but when they are correlated, it may not be.

(a) If Zi and Wi are uncorrelated, is the IV estimator consistent?
In this scenario, we have the following regression model:
Yi = β0 + β1Xi + β2Wi + ui
Where Zi is an instrument and Wi is an omitted variable. If Zi and Wi are uncorrelated, it means that the instrument (Zi) is not related to the omitted variable (Wi). In this case, the IV estimator would be consistent, because the instrument is only affecting the endogenous variable (Xi) and not the omitted variable (Wi).
(b) If Zi and Wi are correlated, is the IV estimator consistent?
In the case where Zi and Wi are correlated, it means that the instrument (Zi) is related to the omitted variable (Wi). When the instrument is correlated with the omitted variable, the IV estimator will not be consistent. This is because the instrument will not only affect the endogenous variable (Xi) but also the omitted variable (Wi), causing biased estimates of the parameters in the regression model.
To summarize, the IV estimator is consistent when Zi and Wi are uncorrelated, but not consistent when Zi and Wi are correlated.

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In order to apply the chi-square test of independence, we prefer to have:
a. at least 5 observed frequencies in each cell. b. not more than 5 observations in each cell.
c. at least 5 expected observations in each cell.
d. at least 5 percent of the observations in each cell.

Answers

At least 5 expected observations in each cell in order to apply the chi-square test of independence, we prefer to have at least 5 expected observations in each cell. The correct answer is c.

The chi-square test of independence is a statistical method used to determine whether two categorical variables are independent or associated with each other.

To apply this test, it is preferred to have at least 5 expected observations in each cell of the contingency table. The expected frequency is calculated based on the assumption of independence between the two variables.

If the expected frequency is less than 5 in any cell, the chi-square test may not be valid and alternative methods, such as Fisher's exact test, should be considered. Having a sufficient sample size can also improve the accuracy and reliability of the test results.

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Find the resultant (sum) of the complex numbers. Express in rectangular form: a+bi.

-6 + 5i, 3i

Please explain how to solve because I have no idea.

Answers

The sum of the two complex numbers is -6 + 8i, which is also in rectangular form.

What is the resultant sum?

To find the sum of two complex numbers, you simply add the real parts and the imaginary parts separately.

Let's take the two complex numbers given in rectangular form:

a + bi = -6 + 5i

c + di = 3i

To find the sum of these two numbers, you add the real parts and the imaginary parts separately:

Real part: (-6) + 0 = -6

Imaginary part: 5i + 3i = 8i

Therefore, the sum of the two complex numbers is -6 + 8i, which is also in rectangular form.

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gabriel leans a 18-foot ladder against a wall so that it forms an angle of 73° with the ground. how high up the wall does the ladder reach?

Answers

The height of wall where the ladder will reach is 17.21 foot according to the angle and length of ladder.

The ladder, wall and ground will form a right angled triangle. Thus, height will be calculated based on the angle. So, sin theta = perpendicular/hypotenuse.

Perpendicular is the wall and hypotenuse is the length of ladder. Now,

sin 73° = perpendicular/18

Perpendicular = 18 × 0.96

Multiply the values on Right Hand Side of the equation

Perpendicular = 17.21 foot

Therefore, the length of the wall is 17.21 foot where ladder will reach.

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The following information pertains to Deal Corp.’s year 2 cost of goods sold:
Inventory, 12/31/Y1
$ 90,000
Year 2 purchases
124,000
Year 2 write-off of obsolete inventory
34,000
Inventory, 12/31/Y2
30,000
The inventory written off became obsolete due to an unexpected and unusual technological advance by a competitor. In its year 2 income statement, what amount should Deal report as cost of goods sold?
a. $218,000
b. $184,000
c. $150,000
d. $124,000

Answers

Based on the information provided, Deal Corp. should report the cost of goods sold in its year 2 income statement as follows:
Beginning inventory (12/31/Y1): $90,000
Year 2 purchases: $124,000
Year 2 write-off of obsolete inventory (not included in COGS, as it's unusual and non-recurring): $0
Ending inventory (12/31/Y2): $30,000
Cost of goods sold (COGS) = (Beginning inventory + Purchases) - Ending inventory
COGS = ($90,000 + $124,000) - $30,000
COGS = $184,000

The correct answer is b. $184,000.
To calculate the cost of goods sold, we need to add the beginning inventory (90,000) to the purchases made during the year (124,000), which gives us a total of 214,000. We then subtract the ending inventory (30,000) from this amount to get the cost of goods sold, which is 184,000.
The write-off of obsolete inventory is not included in the cost of goods sold calculation, as it is an absolute loss and not a cost incurred to produce goods. However, it may still impact the company's income statement as an expense.

Thus, the correct answer is (b) $184,000.

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1) Use Lagrange multipliers to find the maximum and minimum values of the function subject to the given constraint. (If an answer does not exist, enter DNE. )

f(x, y) = 5x2 + 5y2; xy = 1

2) Find the extreme values of f subject to both constraints. (If an answer does not exist, enter DNE. )

f(x, y, z) = x + 2y; x + y + z = 6, y2 + z2 = 4

Answers

The maximum and minimum values for the given two cases are

for the first case

the maximum value = 10

minimum value = 10

for the second case

the maximum value = 7

minimum value = 7

first case,

given, f(x, y) = 5x2 + 5y2; xy = 1

In order to evaluate the maximum and minimum values of the given above function using Lagrange multipliers,

Here the conversion of the Lagrangian function takes priority:

L(x, y, λ) = f(x , y) - λ(x y - 1)

f(x , y) = 5x² + 5y² and x y = 1.

so, we evaluated the partial derivatives of L concerning  x, y and λ:

∂l/∂x = 10x - λy

∂l/∂y = 10y - λx

∂l/∂λ = x y - 1

Staging the partial derivatives = 0 and calculating  for x, y and λ

x = y

x y = 1

10x - λy = 0

10y - λx  = 0

For the set of equation there are two critical points: (1,-1) and (-1,1).

In order to find if the critical points extend to a maximum or minimum value of f(x , y),

Then,

f(1 , -1) = f(-1 , 1) = 10

the maximum value = 10

minimum value = 10

for second case,

Here

f(x,y,z) = x + 2y and x+y+z=6 and y²+z²=4.

so, we evaluated the partial derivatives of L concerning x, y, z, λ1 and λ2:

∂L/∂x = 1 - λ1

∂L/∂y = 2 - λ1 - 2λ2y

∂L/∂λ1 = x + y + z - 6

∂L/∂λ2 = y² + z² - 4

Staging the partial derivatives = 0 and calculating for x, y, z, λ1 and λ2

x = 3

y = 1

z = 2

λ1 = 1/3

λ2 = -1/3

For the set of equation there are critical points correspond to a maximum or minimum values

f(3,1,2) = 7

the maximum value = 7

minimum value = 7

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Please I need help with this I need to turn this in after being sick for a while,

Answers

The measures of the angles are CBD = 50 degrees, DBE = 130 degrees and ABE = 50 degrees

Calculating the measures of the angles

When two lines intersect, they form four angles at the point of intersection. An angle with a measure of 130 degrees will form two types of angles with the other angles at the point of intersection:

Vertical angles:

These are pairs of angles formed by two intersecting lines, where each angle is opposite to the other, and they have the same measure. Therefore, the vertical angle to the 130-degree angle will also measure 130 degrees.

Supplementary angles:

These are pairs of angles whose measures add up to 180 degrees. Therefore, to find the supplementary angle to the 130-degree angle, we subtract 130 degrees from 180 degrees:

180 degrees - 130 degrees = 50 degrees

Therefore, the vertical angle and supplementary angle of an angle that has the measure of 130 degrees are 130 degrees and 50 degrees, respectively.

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In a Class where there are a re 40 students if the average age of 25 boys is 20 and the average age of 15 girls is 16 years, then what is the average age of the class?​

Answers

The average age of the class is 18.5 years.

How to find the average age of the entire class?

We must divide the total age of all students by the total number of students in order to determine the class's average age..

First, let's calculate the total age of the 25 boys:

Total age of boys = 25 x 20 = 500

Next, let's calculate the total age of the 15 girls:

Total age of girls = 15 x 16 = 240

Now, let's calculate the total age of all students:

Total age of all students = 500 + 240 = 740

Finally, let's calculate the average age of the entire class:

Average age of class = Total age of all students / Total number of students

= 740 / 40

= 18.5 years

Therefore, the average age of the class is 18.5 years.

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) use induction to prove that n^2 −5n is even, for every n ∈ n.

Answers

It has been proved that n²-5n is even for every n∈ℕ using induction.

Firstly, take the base case.
Check the base case for n = 1:
(1)² - 5(1) = 1 - 5 = -4, which is even since it's divisible by 2.

Now, assume the inductive hypothesis.
Assume that for some k ∈ ℕ, k² - 5k is even.

That means it can be represented as 2m, where m ∈ ℤ.

Now, consider the inductive step.
Prove that if the statement is true for n = k, it must also be true for n = k + 1.

Evaluate (k + 1)² - 5(k + 1):
(k + 1)² - 5(k + 1) = k² + 2k + 1 - 5k - 5

= (k² - 5k) + 2k - 4

We know from the inductive hypothesis that k² - 5k = 2m.

Substitute this into the expression:
2m + 2k - 4 = 2(m + k - 2)

Since m, k, and 2 are integers, m + k - 2 is also an integer. Let's call it p.

Now we have:
2(m + k - 2) = 2p

The expression is divisible by 2, which means it's even.

Therefore, (k + 1)² - 5(k + 1) is also even.

Therefore, by induction, we have proven that n² - 5n is even for every n ∈ ℕ.

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either fortune favors the foolish and love is eternal or life is meaningless. key:f = fortune favors the foolish. e = love is eternal. m = life is meaningless.

Answers

The correct answer is [tex]F \vee ( E \wedge M )[/tex]

Given statement:

Either fortune favors the foolish, or love is eternal and life is meaningless.

Key:F= Fortune favors the foolish.

E = Love is eternal.

M = Life is meaningless.

Translation:    [tex]F \vee ( E \wedge M )[/tex].

Therefore, the correct Translation is [tex]F \vee ( E \wedge M )[/tex]

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The vertices of triangle DEF are located at (3, 2), (6, 1), and (7, 5).
Which coordinates are the vertices of triangle D'E'F' after DEF has been reflected across the x-axis?
A. (-3, 2), (-6, 1), (-7, 5) B. (3, -2), (6, -1), (7, -5) C. (2, 3), (1, 6), (5, 7) D. (2, -3), (1, -6), (5, -7)

Answers

Answer:

When a point is reflected across the x-axis, the x-coordinate remains the same while the y-coordinate changes sign. So, the correct answer is B. (3, -2), (6, -1), (7, -5).

Step-by-step explanation:

How many gallons of antifreeze does a radiator hold?

Answers

The amount of antifreeze that a radiator can hold depends on the size of the radiator.

Radiators come in different sizes and capacities, and the amount of antifreeze that a radiator can hold can range from less than a gallon to several gallons. In order to determine the exact amount of antifreeze that a particular radiator can hold, you would need to consult the manufacturer's specifications for that radiator or take the radiator to a mechanic who can assess its capacity. Additionally, the amount of antifreeze required may also depend on the make and model of the vehicle that the radiator is installed in.

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