The sales of a product S (in thousands of dollars) are given by 
, where x is the advertising expenditure (in thousands of dollars). Find the rate of change of sales with respect to advertising expenditure. Use the second derivative to find how this rate is changing at 
varid="variable_id_field" variablename="impvar_af3043c08a7441e2858a7f822" />. Round your answer to two decimal places.
?
A. 0.89
B. -0.03
C. 0.00
D. -0.89
E. -0.02
Answer: B
Mathematics
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Use trigonometric identities to solve each equation in the interval [0, 2?]2 tan2 x - 3 sec x = 0
A. ?
B. 
C. 
D. 
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Graph the hyperbola.
- 
= 1
A. 
B. 
C. 
D. 
Mathematics
Simplify the expression. Use a calculator as needed.
A) 226.08
B) 224.96
C) 224.63
D) 228.22
E) 228.75
Mathematics
Provide an appropriate response.True or false? If a > 0, then 
= ia.
A. True B. False
Mathematics