Please help me with this question :)

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

What is x3+3x2−16x−48 divided by x−1?

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6