Solve the problem.Suppose the government wants to impose a tax on fossil fuels to reduce carbon emissions. The cost benefit is modeled by 
where x represents the dollars of tax per ton of carbon emitted and P represents the percent reduction in emissions of carbon. (P is in decimal form.) Determine P when 
Round to three decimal places.
A. -0.190
B. 1.806
C. -0.11
D. 0.194
Answer: D
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Solve the problem.In a certain coastal basin, the sea water contains 3.9 grams of salt per 1000 milliliters of water. How many grams of salt would be in 5 liters of the sea water?
A. 195 grams B. 19.5 grams C. 1950 grams D. 0.195 grams
Find the square root. Assume that all variables represent positive real numbers.- 
A. not a real number B. -17 C. -144 D. 17
Use the formula for the sum of the first n terms of a geometric sequence to solve.Find the sum of the first 9 terms of the geometric sequence: 
, 
, 
, 
, 
, . . . .
A. 
B. 
C. 101
D. 
Provide an appropriate response.Which one of the following methods cannot be used to solve the equation x2 - 4x - 1 = 0?
A. All of the methods can be used. B. Quadratic formula C. Completing the square D. Factoring