Evaluate.7 ? 9
A. 54
B. 72
C. 16
D. 63
Answer: D
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Use the figure to answer the question.The wages of the employees of a company are presented in this histogram. Assume that $6 is in the interval $6-$8, not $4-$6, similarly for $8, $10, and $12.
How many employees earn at least $12 and less than $14 an hour?
A. 46 B. 20 C. 16 D. 10
Change the exponential expression to an equivalent expression involving a logarithm.10x = 1000
A. log1000x = 10 B. logx1000 = 10 C. log100010 = x D. log101000 = x
Suppose that the cost function for a commodity is 
dollars. Find the marginal cost at 
units and tell what this predicts about the cost of producing 1 additional unit. Round your answer to two decimal places.
? A. 5.57. The cost to produce the 4th unit is predicted to be $5.57. B. 5.00. The cost to produce the 4th unit is predicted to be $5.00. C. 322.29. The cost to produce the 5th unit is predicted to be $322.29. D. 6.14. The cost to produce the 5th unit is predicted to be $6.14. E. 20.00. The cost to produce the 5th unit is predicted to be $20.00.
Find the LCD.
+ 
A. x(x + 9) B. x(x - 9) C. (x2 + 9)(x2 - 9) D. x(x + 9)(x - 9)