Is 8x+4y=20 perpendicular to x-2y=12

Jermaine has t subway tokens. karen has 4 more subway tokens than jermaine. raul has 5 fewer subway tokens than jermaine. which expression represents the ratio of karen's tokens to raul's tokens

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

What is the solution to the division problem below x3+x2-11x+4/x+4