Pls help me to solve this question

a) Find the second order differentiation for y = 3x4 - 2x2 + x + 5. Then, calculate the gradient when x = 1. b) Determine the coordinates of the critical points on the curve y = x2 - x - 6. Hence, identify their nature and sketch the graph. b) Suppose that a rock is thrown upward from location A, 10 meter from the ground with an early velocity 23ms-1. After t second, the rock height from the ground is given by the following function: s = -5t2 + 23t + 10 i. Find the time for the rock to reach the maximum height from the ground. ii. What is the maximum height reach