Find all numbers for which the rational expression is not defined.
A. y = 4 and y = -4
B. y = 
C. y = 16
D. y = 4
Answer: A
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Find the volume of the solid generated by revolving the region about the y-axis.The region enclosed by x = 
, 0 ? y ? 
, x = 0
A. 
B. 4?
C. 
D. 2?
Find the difference.13 - (5 - 16)
A. 34 B. 2 C. -8 D. 24
Solve the system of equations by the substitution method.
A. (6, -1) B. (1, -6) C. infinite number of solutions D. no solution
Solve the problem.The function f(t) = -0.12t2 + 0.49t + 31.8 models the U.S. population in millions, ages 65 and older, where t represents years after 1990. The function g(t) = 0.53t2 + 12.63t + 105.7 models the total yearly cost of Medicare in billions of dollars, where t represents years after 1990. What does the function 
represent? Find 
(10).
A. Cost per person in thousands of dollars. $11.54 thousand B. Cost per person in thousands of dollars. $10.61 thousand C. Cost per person in thousands of dollars. $0.17 thousand D. Cost per person in thousands of dollars. $0.09 thousand