What is the difference between polynomials? (x^4+x^3+x^2+x)-(x^4-x^3+x^2-x)

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ab=4 and bc=3, find ah, ch and bh.

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

What describes horizontal cross section of the right rectangle 6m 8m 5m