Solve the problem.The value of a particular investment follows a pattern of exponential growth. In the year 2000, you invested money in a money market account. The value of your investment t years after 2000 is given by the exponential growth model 
. By what percentage is the account increasing each year?
A. 6.9%
B. 7.1%
C. 7.4%
D. 7.3%
Answer: A
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Solve the problem.The surface area of a hollow cylinder (tube) is given by 
where h is the length of the cylinder and R1 and R2 are the outer and inner radii. If h, R1, and R2 are measured to be 9 inches, 5 inches, and 6 inches respectively, and if these measurements are accurate to within 0.1 inches, estimate the maximum percentage error in computing S.
A. 0.031% B. 0.051% C. 0.028% D. 0.040%
Solve the problems.The appliance store where the Scott family shops offers a 9% discount for paying cash. The Scott family received a discount of $86. What was their total bill before the discount?
A. $8 B. $10 C. $800 D. $956
Solve the equation.-7a + 3 + 8a = 10 - 21
A. {-34} B. {14} C. {34} D. {-14}
Simplify the expression. Assume that all variables represent positive real numbers.155/8 ? 15-1/8
A. 151/2
B. 
C. 225
D. 159/8