Solve the problem.The graph shows the average cost of a barrel of crude oil for the years 1981 to 1990 in constant 1996 dollars. Find the approximate average change in price from 1981 to 1986. 
Year
A. About -$7/year
B. About -$4/year
C. About -$37/year
D. About -$15/year
Answer: A
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Provide an appropriate response.List four possible tax deductions, and explain the effect that a tax deduction has on taxable income and on income tax due.
What will be an ideal response?
Solve the problem.A camera costs $380. If the sales tax rate is 7%, how much tax is charged and what is the total price? Round your answers to the nearest cent.
A. $266.00, $646.00 B. $26.60, $406.60 C. $22.80, $402.80 D. $30.40, $410.40
Solve the problem.Suppose a cost-benefit model is given by 
where y is the cost in thousands of dollars for removing x percent of a given pollutant. Find the cost of removing 40% to the nearest dollar.
A. $6500 B. $4333 C. $666 D. $2600
Evaluate the expression without a calculator.ln e9
A. 
B. 1
C. 9
D. e ln 9