Find a general term an for the geometric sequence.a1 = - 
and r = -2
A. an = - 
+ 
(n - 1)
B. an = - 
? (-2)(n-1)
C. an = 
n-1 + 
D. an = - 
- 
(n - 1)
Answer: B
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Solve the problem.The function A = Aoe-0.0077x 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. If 500 pounds of the material are placed in the vault, how much time will need to pass for only 270 pounds to remain?
A. 160 years B. 85 years C. 90 years D. 80 years
Simplify. Express your answer with positive exponents. Assume that all variables are nonzero.x-7
A. - 
B. x1/7
C. 
D. -x7
Use even and odd properties of the trigonometric functions to find the exact value of the expression.sin 
A. 
B. - 
C. - 
D. 
The function 
satisfies the hypotheses of Rolle’s Theorem on the interval [0, ?/2]
Find all values of c that satisfy the conclusion of the theorem. a. 0 b. ?/4 c. 0, ±?/4 d. 0. ?/4