Perform the indicated operation.37 ? (-21)
A. 777
B. -814
C. -777
D. -877
Answer: C
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Solve the problem.A certain radioactive isotope decays at a rate of 2% per 100 years. If t represents time in years and y represents the amount of the isotope left then the equation for the situation is 
In how many years will there be 93% of the isotope left?
A. 363 years B. 253 years C. 350 years D. 700 years
Solve the problem.In triangle ABC, the measure of angle B is 5° more than three times the measure of angle A. The measure of angle C is 15° more than the measure of angle A. Find the angle measures.
A. A = 32°, B = 47°, C = 101° B. A = 47°, B = 101°, C = 32° C. A = 32°, B = 101°, C = 47° D. No solution
Evaluate the integral by using a substitution prior to integration by parts.
A. x[cos (ln x) + sin (ln x)] + C
B. 
[cos (ln x) - sin (ln x)] + C
C. x cos (ln x) + sin (ln x)+ C
D. 
[cos (ln x) + sin (ln x)] + C
Solve the problem by using a system of equations.The distance between city A and city B is 250 mi more than the distance between city C and city D. Together, the two distances total 1500 mi. How far is it between city A and city B? How far is it between city C and city D?
A. City A and B: 875 mi; City C and D: 625 mi B. City A and B: 875 mi; City C and D: 750 mi C. City A and B: 750mi; City C and D: 625 mi D. City A and B: 1500 mi; City C and D: 1250 mi