Write a cost function for the problem. Assume that the relationship is linear.An electrician charges a fee of $55 plus $40 per hour. Let C(x) be the cost in dollars of using the electrician for x hours.
A. C(x) = 55x - 40
B. C(x) = 55x + 40
C. C(x) = 40x - 55
D. C(x) = 40x + 55
Answer: D
You might also like to view...
Determine whether the given function satisfies a Laplace equation.f(x, y) = e3ysin 3x
A. No B. Yes
Complete the truth table by filling in the required columns.p ? ~ q 
A. 
B. 
C. 
D. 
Solve. Provide answers in interval notation.
> 0
A. 
B. 
C. 
D. (0, ?)
Solve the problem.Economists use what is called a Leffer curve to predict the government revenue for tax rates from 0% to 100%. Economists agree that the end points of the curve generate 0 revenue, but disagree on the tax rate that produces the maximum revenue. Suppose an economist produces this rational function 
where R is revenue in millions at a tax rate of x percent. Use a graphing calculator to graph the function. What tax rate produces the maximum revenue? What is the maximum revenue?
A. 28.8%; $272 million B. 30.9%; $382 million C. 27.0%; $379 million D. 38.4%; $383 million