The limit of average rates of change from x to x + (delta)x approahces the instantaneous rate of change. This is given by the following mathematical expression. f(x + Ax) f(x) lim Ax Ax+0 lim [ {f(x + (delta)x) - f(x)} / {(delta)x} ] Evluate this expression for each of the following functions. a) f(x) = 5 - 2x { f(x) = 5 - 2x } b) g(x) = x2 - 4x { g(x) = x^2 - 4x