e_Proble. 2/4 100% + 9) The instantaneous rate of change in f does not exist at x = 3. Why? For problems 10-13, set up and evaluate a limit to compute the instantaneous rate of change (a.k.a the slope of the tangent line) of the function at the indicated x-value. 10) f (x) = 7x - 9 at x = 2. 11) g(x) = 12 at X = 4. 12) h(x) =2x2 + 10x at x = 3 13) k(x) = at x = 8