Solve the problem.The psychology lab at a college is staffed by 7 male doctoral students, 8 female doctoral students, 10 male undergraduates, and 13 female undergraduates. If a person is selected at random from the group, find the probability that the selected person is an undergraduate or a female.
A. 
B. 
C. 
D. 
Answer: C
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Solve the problem.Assume the cost of a gallon of milk is $3.40. With continuous compounding, find the time it would take the cost to be 4 times as much (to the nearest tenth of a year), at an annual inflation rate of 6%.
A. 0.1 yr B. 0.0 yr C. 23.1 yr D. 8.5 yr
Use the accompanying graph of y = f(x) to sketch the graph of the indicated equation.y = f(x) - 3
A. 
B. 
C. 
D. 
Solve the problem.Sue rowed her boat across Lake Bend and back in 3 hours. If her rate returning was 2 mph less than the rate going, and if the distance each way was 7 miles, find her rate going.
A. 5.9 mph B. 1.5 mph C. 5.5 mph D. 3.7 mph
Use the discriminant to find what type of solutions (two rational, two irrational, one rational, or two nonreal complex) each of the following equations has. Do not solve the equation.4x2 + 12x + 9 = 0
A. two nonreal complex solutions B. one rational solution C. two rational solutions D. two irrational solutions