Solve the problem.The function A = Aoe-0.0099x 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 200 pounds of the material are placed in the vault, how much time will need to pass for only 41 pounds to remain?
A. 165 years
B. 170 years
C. 160 years
D. 320 years
Answer: C
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Solve the problem.Let f(x) = x2 + 5x - 7. Find a such that f(a) = 7.
A. 7, 2 B. 7, -2 C. -7, -2 D. -7 , 2
Solve the problem.A formula used by an engineer to determine the safe radius of a curve, R, when designing a particular road is: 
where ? is the superelevation of the road and V is the velocity (in feet per second) for which the curve is designed. If 
f = 0.1
, and 
find V. Round to the nearest foot per second.
A. V = 74 ft per sec B. V = 71 ft per sec C. V = 69 ft per sec D. V = 67 ft per sec
Solve the problem.Natasha rides her bike (at a constant speed) for 4 hours, helped by a wind of 3 miles per hour. Pedaling at the same rate, the trip back against the wind takes 10 hours. Find find the total round trip distance she traveled.
A. 20 mi B. 40 mi C. 14 mi D. 80 mi
Match the equation to the correct graph.y = (x + 5)2
A. 
B. 
C. 
D. 