Solve the problem.The number of bacteria growing in an incubation culture increases with time according to 
where x is time in days. Find the number of bacteria when x = 0 and x = 4.
A. 8600, 172,000
B. 8600, 26,875,000
C. 43,000, 5,375,000
D. 8600, 5,375,000
Answer: D
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Solve the polynomial inequality and graph the solution set on a number line. Express the solution set in interval notation.x2 + 7x ? 0
A. (-?, -7]
B. (-?, -7] ? [0, ?]
C. [0, ?]
D. [-7, 0]
Solve the problem.Jackie decided to save for retirement and wants to have $575,000 in her retirement savings account at the end of 25 years. The APR is 6.0% compounded monthly and contributions to the account are made at the end of each month, including the last month. What does Jackie need to contribute monthly?
A. $829.73 B. $923.49 C. $868.76 D. $855.59 E. $793.75
Solve the problem.Kimberly invested 
in her savings account for 8 years. When she withdrew it, she had 
. Interest was compounded continuously. What was the interest rate on the account? Round to the nearest tenth of a percent.
A. 3.9% B. 3.8% C. 3.95% D. 3.7%
Use the fundamental identities to simplify the expression.
+ sec ? cos ?
A. sec2? B. csc2? C. tan2? D. 1