Solve the problem.Suppose a cost-benefit model is given by y = 
, where y is the cost in thousands of dollars for removing x percent of a given pollutant. Find the cost of removing 80% to the nearest dollar.
A. $1680
B. $4000
C. $8400
D. $2100
Answer: C
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Find the polar equation for the curve represented by the given Cartesian equation. Select the correct answer.
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Solve the problem.A small business owner made $30,000 the first year he owned his store and made an additional 
over the previous year in each subsequent year. Find how much he made during his fourth year of business. Find his total earnings during the first four years. (Round to the nearest cent, if necessary.)
A. $205,770.00; $401,070.00 B. $38,850.87; $137,193.87 C. $390,963.00; $792,033.00 D. $21.87; $32,964.87
Divide. Write the quotient in lowest terms.
÷ -3
A. - 
B. 
C. - 
D. - 
Provide an appropriate response.In a raffle 1000 tickets are being sold at $1.00 each. The first prize is $100, and there are 3 second prizes fo $50 each. By how much does the price of a ticket exceed its expected value?
A. $1.00 B. $0.75 C. $1.75 D. $50