Helpp function operations

How do you find the distance of each number from the mean

What is the slope of any line parallel to the line 8x+9y=3 in the standard (x, y) coordinate plane?

3questions show how you solved the problem 1. subtract & simplify (–y2 – 4y – 8) – (–4y2 – 6y + 3) 2.multiply and simplify 2x2y3z2 · 4xy4x2 3.multiply and simplify (x – 4) (x2 – 5x – 6)