Using the derivative of f(x) given below, determine the critical points of f(x).f'(x) = (x + 9)(x + 3)
A. -12
B. -9, -3
C. 3, 9
D. 0, -9, -3
Answer: B
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Write as a percent.0.53
A. 5.3% B. 530% C. 53% D. 0.053%
Provide an appropriate response.Finish the statement with a correct response. To divide two fractions one needs to:
A. Use the reciprocal of the second fraction (divisor), add the numerators and multiply the denominators. B. Use the reciprocal of the second fraction (divisor) and multiply. C. Add the numerators and multiply the denominators. D. Add the numerators and factor the denominators.
Solve.In baseball, the average number of earned runs given up by a pitcher in 9 innings is the pitcher's earned run average (ERA). For example, if a pitcher allows 90 earned runs in 250 innings, his ERA is found by solving the proportion 
= 
. Find the ERA for a pitcher who gives up 99 earned runs in 229 innings. Round your answer to the nearest hundredth.
A. 20.82 B. 3.89 C. 11.00 D. 2.31
Suppose the annual sales S of a new product is given by 
where t is time in years. Find the exact time when the annual sales are increasing at the greatest rate. Round your answer to three decimal places.
?
A. 
years
B. 
years
C. 
years
D. 
years
E. 
years