Solve the equation for the indicated variable. (Leave ± in your answer, when appropriate.)r = 
for A
A. A = ± 
B. A = 2?r2
C. A = 2?r
D. A = ± 2?
Answer: B
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Use a proportion to solve the problem.It takes 60 oz of grass seed to seed 3300 ft2 of lawn. At this rate, about how much would be needed for 
of lawn? Round to the nearest whole number.
A. 106 oz B. 107 oz C. 330,000 oz D. 109 oz
Four accounting majors, two economics majors, and three marketing majors have interviewed for five different positions with a large company. Use the following information to find the number of different ways that five of these could be hired.One accounting major, one economics major, and one marketing major would be hired, then the two remaining positions would be filled by any of the majors left.
A. 48 ways B. 4320 ways C. 2160 ways D. 720 ways
Identify the polynomial as a monomial, binomial, trinomial, or none of these.16y4 - 7
A. Monomial B. Binomial C. Trinomial D. None of these
Solve the problem.A company finds that when it spends x million dollars on advertising, its profit P, in thousands of dollars, is given by 
Currently the company spends 18 million dollars on advertising. Use the marginal profit to estimate the change in profit if the company increases its advertising expenditure by one million dollars.
A. -109 thousand dollars B. 486 thousand dollars C. 630 thousand dollars D. 1180 thousand dollars