Can someone help me solve these two questions?

Thanks
1) Use the mid-point rule with n = 4 to approximate the area of the region bounded by y = -x^3 and y = -x.
2) A rock is thrown upward with a speed of 48 feet per second from the edge of a cliff 400 feet above the ground. What is the speed of the rock when it hits the ground? Use acceleration due to gravity as -32 feet per second squared.

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