A total-cost function is given by  where C(x) is the total…

 A tоtаl-cоst functiоn is given by  where C(x) is the totаl cost, in thousаnds of dollars, of producing x airplanes.  A total-revenue function is given by , where R(x) is the total revenue, in thousands of dollars from the sale of x airplanes.  a) Write the total profit equation. Don’t simplify. b) Find the profit when 10 airplanes have been produced and sold. c) Find the rate the total profit is changing when 10 airplanes have been produced and sold. Indicate units in your answer. Type the answers in the space provided.  Show all work on the whiteboard, and show the whiteboard to the camera. Then, erase the whiteboard.