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3 years ago

Pls help and explain

Mathematics

1 answer:

Rzqust [24]3 years ago

5 0

Answer: C is closest to the correct answer

<u>Step-by-step explanation:</u>

Convert the inches into feet (12 inches equal 1 foot). Then convert the mixed fractions into improper fractions and multiply.

$11\ ft\ 2\ in=11\dfrac{2}{12}ft\qquad\longrightarrow \qquad11\dfrac{1}{6}ft\qquad =\qquad \dfrac{67}{6}\ ft\\\\\\9\ ft\ 10\ in= 9\dfrac{10}{12}ft\qquad\longrightarrow \qquad9\dfrac{5}{6}ft\qquad =\qquad \dfrac{59}{6}\ ft\\\\\\\dfrac{67}{6}\ ft\times \dfrac{59}{6}\ ft\times \dfrac{\$2.50}{ft^2}=\dfrac{\$9,882.50}{36}\qquad \longrightarrow \qquad \large\boxed{\$274.51}$

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Randomization is important to ensure that both groups are roughly equivalent regarding students’ preparedness, anxiety levels, and study skills.

<h3>What is randomization in an experiment?</h3>

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2 years ago

If point A is located at (5,-7) and there are 8 points between A and B, what could be the possible coordinates for point B?

aleksandr82 [10.1K]

Answer: The possible cordinates (X,Y) of B can be found with the formula Y = √(8^2 - (X- 5)^2) - 7 where -3 ≤ X ≤ 13

Step-by-step explanation:

The point A is located at (5, -7)

And we know that we have 8 units of difference between A and B.

The equation of a circle centerd in the point (x0, y0) is:

(x - x0)^2 + (y - y0)^2 = r2

where r is the radius of the circle

So we can draw a circle of 8 units around A, and get:

(X - 5)^2 + (Y - (-7))^2 = 8^2

So from this equation we can find all the possible values of B, for this we can isolate one of the variables in one side and get a function.

Y = √(8^2 - (X- 5)^2) - 7

So for a given value of X, you can find the value of Y. where you need to remember that (8^2 - (X-5)^2) can not be a negative number, so we must have that:

8^2 ≥ (X - 5)^2

So X can go from -3 (because (-3 - 5)^2 = 8^2)

to X = 13 (because (13 - 5)^2 = 8^2)

So X is in the range {-3, 13}

4 0

3 years ago

Read 2 more answers

You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estim

pogonyaev

Answer:

$n=\frac{0.5(1-0.5)}{(\frac{0.025}{1.28})^2}=655.36$

And rounded up we have that n=656

Step-by-step explanation:

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 80% of confidence, our significance level would be given by $\alpha=1-0.80=0.20$ and $\alpha/2 =0.10$ . And the critical value would be given by:

$z_{\alpha/2}=\pm 1.28$

Solution to the problem

The margin of error for the proportion interval is given by this formula:

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

Since we don't have prior info for the proportion of interest we can use $\hat p=0.5$ as estimator. And on this case we have that $ME =\pm 0.025$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

And replacing into equation (b) the values from part a we got:

$n=\frac{0.5(1-0.5)}{(\frac{0.025}{1.28})^2}=655.36$

And rounded up we have that n=656

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3 years ago

What is the redosed fraction for 3897/1000

Nadusha1986 [10]

Answer:

3000.897

Step-by-step explanation:

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3 years ago

Find the interval(s) of upward concavity on this accumulation function.

maxonik [38]

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Hope this helps.

6 0

3 years ago