A PDF for a continuous random variable X is given. Use the PDF to find E(X).f(x) = 
A. 
B. 
C. 1
D. 
Answer: A
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Solve.In 1985, the number of female athletes participating in Summer Olympic-Type Games was 500. In 1996, about 3550 participated in the Summer Olympics in Atlanta. Assuming that 
and that the exponential model applies, find the value of k rounded to the hundredths place, and write the function.
A. k = 0.2; P(t) = 500e0.2t B. k = 0.18; P(t) = 500e0.18t C. k = 0.18; P(t) = 500e0.28t D. k = 0.16; P(t) = 500e0.16t
Factor completely. If the polynomial is prime, say so.36 - 4r - 9t + rt
A. (9 - r)(4 + t) B. (9 + r)(4 - t) C. (9 + r)(4 + t) D. (9 - r)(4 - t)
Find the inverse of the function.f(x) = x3 - 4
A. f-1(x) = 
+ 64
B. f-1(x) = 
+ 4
C. f-1(x) = 
- 4
D. f-1(x) = 
Solve the system of equations by substitution.
A. x = -6, y = 6; (-6, 6) B. x = 6, y = -6; (6, -6) C. x = 7, y = -7; (7, -7) D. x = -7, y = 7; (-7, 7)