Perform the indicated operations and simplify the result. Leave the answer in factored form.
A. 
B. x2 + 7
C. 
D. 7
Answer: A
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Solve by completing the square. Give exact solutions. Simplify radicals and reduce.x2 = 9 - 4x
A. -2 ± 1
B. -2 ± 
C. 2 + 
D. -1 ± 
Add or subtract as indicated. Simplify if necessary.
- 2
A. - 
B. 
C. - 
D. - 
Solve the pair of linear equations by addition.
What will be an ideal response?
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