Simplify -12x^4/x^4+8x^5 a. -12x^4/1+8x; where x does not equal -1/8 b. -12x^4/1+8x; where x does not equal -1/8, 0 c. 12/9x; where x does not equal 0 d. 12/9; i know that the answer is either a or b, but i have no idea what x does not equal.

Scenario: a rectangular plot of ground is 5 meters longer than it is wide. its area is 20,000 square meters. question: what equation will you find the dimensions? note: let w represent the width. options: w(w+5)=20,000 w^2=20,000+5 (w(w+5))/2=20,000 w+2(w+5)=20,000