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4 years ago

Translate the verbal expression into an equation.

Mathematics

1 answer:

marin [14]4 years ago

8 0

Answer:

D. 4x = 20

Step-by-step explanation:

Four times a number is 20

Let x be the number

4x = 20

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What's the formula to find the area of a trapezoid? I forgot.

Pavlova-9 [17]

The formula for area of a trapezoid is:

$\frac{a+b}{2} \times h$

Sides a is the top line and side b is the base, or bottom line. Add the sides together and divide by 2. After you do that, multiply the answer by the height.

Height is the length between the two sides, a and b.

7 0

4 years ago

PLZZ ANSWER QUESTION 18

gtnhenbr [62]

In order to find the other end point we must know where the End point is.

·(5,-3)

In order to find out the new point we must know how long the line segment is.

·8 units.

Knowing this we would use the equation ΔY/ΔX to find the new point

·ΔY= Y²-Y
·ΔX=X²-X

Knowing this we just plug our points in, and we use process of elimination to get our answer.

First we will try choice A.

· (5,-3)
·(-3,-3)

To get from Y²⇒Y= 8 Units, and to get from X²⇒X=0 Units.

·8+0=8

-In conclusion your answer is A, i hope this is the answer you are looking for, feel free to post your questions here on brainly in the future.

3 0

3 years ago

Please help I will mark brainliest!!!!!!!!!!

Oxana [17]

Answer:

9/10 pounds

Step-by-step explanation:

3/5 × 1 1/2

= 9/10

5 0

3 years ago

To estimate the mean height μ of male students on your campus,you will measure an SRS of students. You know from government data

nexus9112 [7]

Answer:

a) $\sigma = 0.167$

b) We need a sample of at least 282 young men.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by

$Z = \frac{X - \mu}{\sigma}$

This Zscore is how many standard deviations the value of the measure X is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

(a) What standard deviation must x have so that 99.7% of allsamples give an x within one-half inch of μ?

To solve this problem, we use the 68-95-99.7 rule. This rule states that:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviations of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we want 99.7% of all samples give X within one-half inch of $\mu$ . So $X - \mu = 0.5$ must have $Z = 3$ and $X - \mu = -0.5$ must have $Z = -3$ .

$Z = \frac{X - \mu}{\sigma}$

$3 = \frac{0.5}{\sigma}$

$3\sigma = 0.5$

$\sigma = \frac{0.5}{3}$

$\sigma = 0.167$

(b) How large an SRS do you need to reduce the standard deviationof x to the value you found in part (a)?

You know from government data that heights of young men are approximately Normal with standard deviation about 2.8 inches. This means that $\sigma = 2.8$