2 years ago

WORTH 10 points. Explain work

1 answer:

6 0

This should help you. Use the Pythagorean theorem and you will find the length of the hypotenuse of a right triangle here

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The square of x increased by the cube of y

Aloiza [94]

Answer: This phrase is expressed as follows:
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" x² + y³ " .
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3 years ago

Two equations are given below:

ycow [4]

Hello,

a-3b=4 (1)
a-b=-2 (2)

(1)-(2)==> -2b=6
=>b=-3 and a=-2+(-3)=-5

Answer D

Proof
-5+3=-2
-5-3(-3)=4

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3 years ago

Scores from an exam are normally distributed with a mean of 85 and a standard deviation of 5. Suppose 188 students take the exam

charle [14.2K]

The mean is $\mu=85$ and standard deviation is $\sigma=5$ . Then the variable $X\sim N(85,5)$ .

Use substitution $Z=\dfrac{X-\mu}{\sigma}=\dfrac{X-85}{5}$ , then the variable $Z\sim N(0,1)$ .

The probability $Pr(X>80)$ can be calculated in the following way:

for X=80, $Z=\dfrac{80-85}{5} =-1$ and $Pr(X>80)=Pr(Z>-1)$ . From the diagram $Pr(Z>-1)=0.34+0.34+0.135+0.025=0.84$ .

Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80

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3 years ago

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Tell whether each statement is always (A), sometimes (S), or never (N) true.

AnnZ [28]

N an acute angle is 90 degrees or less and 90 + 90 is 180 and an obtuse angle is always more than 90 and always less than 180

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3 years ago

Laura finished her history assignment in 1/4 hours. Then she completed her English assignment in 3/5 hours. What was the total a

kobusy [5.1K]

Answer:

0.85 hours

$\frac{17}{20}$ hours

Step-by-step explanation:

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