17. For the function y = 2x", find dy dx4 18. Find t(4) (n) for the function t(n) = 2n - 1/2 + 59/2 *(4) (n) = (Type an expression using n as the variable. Simplify your answer.) 19. Given s(t) = 417 + 16t, where s(t) is in feet and t is in seconds, find each of the following- a) v(t) b) a(t) c) The velocity and acceleration when t = 2 sec a) v(t) = bj a(t) = c) When t = 2 sec, the velocity is (1) (Simplify your answer.) When t = 2 sec, the acceleration is (2) (Simplify your answer.) (1) Oft. (2) O ft/ sec. O sec. Oft. O ft/ sec. O ft/ sec. O ft/ sec O sec