Solve the problem.An advertising agency has discovered that when the Holt Company spends x thousands of dollars on advertising, it results in a profit increase in thousands of dollars given by the function 
How much should the Holt Company spend on advertising to maximize the profit?
A. $8000
B. $60,000
C. $63,000
D. $6000
Answer: A
Mathematics
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Solve the problem.Find the sum of the infinite series 1 + 9r + r2 + 9r3 + r4 + 9r5 + r6 + . . . for those values of r for which it converges.
A. 
B. 
C. 
D. 
Mathematics
Solve.William earned an extra $9000 last year from a part-time job. He invested part of the money at 8% and the rest at 10%. He made a total of $800 in interest. How much was invested at 10%?
A. $4000 B. $4500 C. $7000 D. $5000
Mathematics
Divide.231,864 ÷ 310
A. 747 R 294 B. 747 C. 294 D. 747 R 264
Mathematics
Provide an appropriate response.42% of what number is 27.636? Use the percentage proportion.
A. 0.116 B. 0.658 C. 65.8 D. 11.607
Mathematics