Suppose that a company's sales volumey(in dollars) is related to its advertising expendituresx(in dollars) according to 
Find the rate of change of sales volume, with respect to advertising expenditures when x = $70. Round your answer to two decimal places.
A. 2.96
B. 0.84
C. 0.66
D. 0.19
E. 0.24
Answer: D
Mathematics
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A. {37} B. {25} C. {-37} D. {-25}
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Find the exact value of the expression.cos 
sin 
- cos 
sin 
A. 
B. 
C. 
D. 1
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Use grouping to factor the polynomial.x3 + 4x2 + 5x + 20
A. (x2 + 5)(x + 4x) B. (x2 + 5)(x - 4) C. (x2 + 5)(x + 4) D. (x3 + 5)(x + 4)
Mathematics
Solve the absolute value equation.|x + 3| = |9 - x|
A. 
B. {6}
C. 
D. ?
Mathematics