Solve the problem.The function f(x) = 300(0.5)x/90 models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. Find the amount of radioactive material in the vault after 
Round to the nearest whole number.
A. 220 pounds
B. 333 pounds
C. 68 pounds
D. 64 pounds
Answer: D
Mathematics
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Reverse the order of integration and then evaluate the integral.
A. 
(1 - cos 2)
B. 
(1 - cos 2)
C. cos 2 - 1
D. 2(1 - cos 2)
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Answer the following statement(s) true (T) or false (F)
For the AP Statistics examination, students must understand experimental study design as well as survey study design.
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If y varies directly as x, find the direct variation equation for the situation.y = 4 when x = 6
A. y = 
x
B. y = x - 2
C. y = 2x
D. y = 
x
Mathematics
Solve the problem. Round to the nearest tenth, if necessaryThe part is 50 and the whole is 10. Find the percent.
A. 250% B. 500% C. 20% D. 50%
Mathematics