Solve the problem. Round to the nearest hundredth, if necessary.Assume that the mean length of a human pregnancy is 268 days with a standard deviation of 9 days. What percentage of human pregnancies do we expect to last no more than 261 days?

A. 21.77%
B. 22.66%
C. 19.22%
D. 21.19%

Answer: A

Mathematics

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Use the rules for exponents to rewrite the expression and then evaluate the new expression. (2-2)0 

A. 1
B.
C. 0
D. -4 

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Find the real solutions of the equation.x2/3 - 3x1/3 - 10 = 0

A. {-8, 125} B. {-5, 2} C. {-125, 8} D. {-2, 5}

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Divide.21 ÷ 4

A. 6.25 B. 5.25 C. 5 D. 0.525

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Solve the problem.A closed box with a square base has to have a volume of 17,000 cubic inches. Find a function for the surface area of the box.

A. S(x) = 2x2 + 
B. S(x) = x2 + 
C. S(x) = 2x2 + 
D. S(x) = 2x2 + 

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Mathematics