3 questions to be answered I need the answers separately and the work please I need this in 20 minutes

Question 15 C5 pts 91 0 Details Given f(z) = -, find f' (x) using the limit definition of the derivative. f' (I)= Question 16 3 pts 9 1 0 Details Given [ glu)du - 21 and [ glu)du = 8.7, evaluate the following integral. Question 17 C5 pts 9 1 0 Details The function s(t) = 35 3 2 41 2 + 12t represents the position function for a particle moving along a line (1 dimensional motion) for t in [0, 2]. a.) Find the intervals where the particle is moving to the right. If there is more than one interval, separate your answers by a comma. b.) Find the itnervals where the particle is moving to the left. If there is more than one interval, separate your answers by a comma