Solve.Suppose that $8000 is invested at an interest rate of 5.2% per year, compounded continuously. What is the doubling time?
A. 12.3 yr
B. 2 yr
C. 13.3 yr
D. 14.3 yr
Answer: C
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Answer as requested.A researcher finds a positive correlation between the amount of wine people drink and the number of friends they have. Which of the following statements must be true? More than one statement may be true.A: People who drink more tend, on average, to have more friends.B: If a person starts drinking more wine, they are likely to find themselves with more friends.C: If a person stops drinking wine, they are likely to find themselves with fewer friends. D: If Anna has more friends then Pierre, she must drink more wine than Pierre.
A. A and B B. A C. B and C D. A and D
Evaluate the expression. 
4
A. 
B. - 
C. 
D. - 
Divide using long division.
A. 7r2 + 2r + 5
B. 7r2 - 2r - 5
C. r2 + 5r + 2
D. 7r2 + 2r + 
Solve the problem.A weight attached to a spring is pulled down 5 inches below the equilibrium position. Assuming that the period of the system is 
second, determine a trigonometric model that gives the position of the weight at time t seconds.
A. y = 5cos 
t
B. y = -5cos 16?t
C. y = 5cos 16?t
D. y = -5cos 8?t