[1.92/2.56 Points] DETAILS PREVIOUS ANSWERS LARPCALCLIMS 1.3.095. MY NOTES ASK YOUR TEACHER A roofing contractor purchases a shingle delivery truck with a shingle elevator for $40,800. The vehicle requires an average expenditure of $9.50 per hour for fuel and PRACTICE ANOTHER maintenance, and the operator is paid $12.50 per hour. (a) Write a linear equation giving the total cost C of operating this equipment for 2 hours. (Include the purchase cost of the equipment.) c(t) 40800+ 22.00r (b) Assuming that customers are charged $46 per hour of machine use, write an equation for the revenue R obtained from t hours of use. R(t)=461 (c) Use the formula for profit PR-C to write an equation for the profit obtained from t hours of use. P(C)-40800-46 x (d) Use the result of part (c) to find the break-even point-that is, the number of hours this equipment must be used to yield a profit of 0 dollars. 40800/24 hr