Use the problem-solving strategy to solve the problem and find the unknown number.4 times the difference between a number and 8 yields the difference between 5 times the number and 12.
A. -4
B. -20
C. 4
D. 20
Answer: B
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Match the shaded region with the set operation.A ? B
A. 
B. 
C. 
D. 
Find the value of df-1/dx at x = f(a).f(x) = 4x + 6, a = 4
A. 
B. 
C. 4
D. 6
Solve the problem.June made an initial deposit of $5000 in an account for her son. Assuming an interest rate of 10% compounded quarterly, how much will the account be worth in 19 years? Round to the nearest cent.
A. $31,861.04 B. $32,657.56 C. $13,097.87 D. $31,927.39
An object attached to a coiled spring is pulled down a distance a from its rest position and then released. Assuming that the motion is simple harmonic with period T, write an equation that relates the displacement d of the object from its rest position after t seconds. Also assume that the positive direction of the motion is up.a = 5;
T = 10 seconds
A. d = 5 cos (10t)
B. d = -5 cos 
C. d = -5 cos (10t)
D. d = 5 cos 