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omeli [17]
3 years ago
11

For the function y=2x^2-7 , which of these values of x corresponds to y=1

Mathematics
1 answer:
amm18123 years ago
6 0
1=2x^2-7
2x^2=8
x^2=4
so x=2 or x=-2
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Suppose the mean height for adult males in the U.S. is about 70 inches and the standard deviation is about 3 inches. Assume men’
nlexa [21]

Question options :

a. They should be between 64 and 76 inches tall.

b. They should be close to the height that is 95% of the mean. That is, 66.5 inches, plus or minus 2 standard deviations.

c. They should be at or below the 95th percentile, which is 74.92 inches.

d. None of the above.

Answer: a. They should be between 64 and 76 inches tall.

Step-by-step explanation:

Given the following :

Assume men's height follow a normal curve ; and :

Mean height = 70 inches

Standard deviation= 3 inches

According to the empirical rule ;

Assuming a normal distribution with x being random variables ;

About 68% of x-values lie between -1 to 1 standard deviation of the mean. With about 95% of the x values lying between - 2 and +2 standard deviation of mean. With 99.7% falling between - 3 to 3 standard deviations from the mean.

Using the empirical rule :

95% will fall between + or - 2 standard deviation of the mean.

Lower limit = - 2(3) = - 6

Upper limit = 2(3) = 6

(-6+mean) and (+6+ mean)

(-6 + 70) and (6+70)

64 and 76

8 0
3 years ago
What is the volume of two cubes with a side length of 1/2 foot? V = s^3, where s is the side length.
Luden [163]

Answer:

So the answer should be 1/4.

Step-by-step explanation:

so a cube has all equal sides and volume is equal to s^3 or side*side*side in this case 1/2*1/2*1/2. There are two  cubes so you would multiply that by two creating 2*1/2*1/2*1/2

Hope this helps :)

Please tell me if not.

8 0
3 years ago
Read 2 more answers
Please help me......................
Tresset [83]
I’m pretty sure that the first one is one
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