Mark dug a 20 foot hole in 4 hours. which rational number shows the average depth mark dug each hour? check all that apply.
(a) –5
(b) −20\4
(c) −4\20
(d) −20\4
(e) −4\20
(f) −20\−4

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.