Perform the indicated operation and write your answer with positive integer exponents.
? 
A. 
B. 
C. -1
D. 1
Answer: C
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Use implicit differentiation to find dy/dx and d2y/dx2.y2 - x2 = 6
A. 
= 
; 
= 
B. 
= 
; 
= 
C. 
= - 
; 
= 
D. 
= 
; 
= 
Find a polar equation in the form r cos(? - ?0) = r0 for the given line.
x - 
y = 10
A. r cos 
= 10
B. r cos 
= 5
C. r cos 
= 10
D. r cos 
= 5
List the like terms of the expression.7x - 5x + 2
A. 7x, - 5x, and 2 are like terms B. 7x and - 5x are like terms C. There are no like terms D. 7x and 2 are like terms
Solve the problem.An insurance company says that at age 50 one must choose to take 
at age 60, $30,000 at 70, or 
at 80 ($0 death benefit). The probability of living from 50 to 60 is 0.85, from 50 to 70, 
, and from 50 to 80, 0.46. Find the expected value at each age.
A. 60 - $8500 70 - $13,800 80 - $23,000 B. 60 - $8500 70 - $18,300 80 - $23,000 C. 60 - $6100 70 - $18,300 80 - $23,000 D. 60 - $8500 70 - $25,500 80 - $42,500