Subtract (−2x^4−2x^3+8x^2+2)−(x^4−5x^3+2x+7)

Quick translate "x is 12 units from 20" into an equation. what are the values of x being described? if you can answer any of my other questions that'd be great too

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

The candy store is having a 30% off sale. emma is going to buy $7.50 worth of candy. how much will she pay after the discount