15. Dan drove 512 miles in 8 hours. What was his average speed for the trip? Solve each equation for the given variable. 17) (A/B) - 8 = C/D solve for A #19) P = ( M+ N) / -5 solve for N 20. A large box shaped like a rectangular prism needs to be painted. a. Write a formula for the area A to paint in terms of length l, width w, and height h. b. Rewrite the formula to find l in terms of A, h, and w. c. If h is 36 in., w is 28 in. and A is 6112 in.2, what is the length of th