(y^2 - 3y - 20) / (y-7)
use long or synthetic division to find the following quotients.

Bring the fraction a/a-4 to a denominator of 16-a^2

Which is the focus of a parabola with equation y2=4x

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|