A remote control plane takes off from a window 50 feet above the ground. The rate of change of height in feet/sec at x seconds after take-off is given by TB = 2" - 7, x 2 0. The graph below at left shows TB(in blue) and also r(in red), an approximate rate of change function for the height of the remote control plane, based on intervals of Ax = 2 seconds and the "left" approach to approximationg constant rates. 20 y 16 12 X 2 w- 4 6 7 -4 -8 1. Complete writing the piecewise function, r,using the function rule given above to determine values of approximate rates to use in each interval A if O K x