Need help with homework

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

This is my question~~ ( r ^ 4 - 2r ^ 3 - 23 r ^ 2 - 4r - 32)÷(r+4) ~~ i must use long division to solve it : / i was wondering if anyone world like to solve it. and if so, share step-by-step explanations! you! ❤

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?