Answers by visitors named: Safia

(X+4)(x+9)-x(x+5)=76 (x^2+9x+4x+36)-x(x+5)=76 x^2+13x+36-x^2-5x=76 X^2 will drop and we will combine the like terms(13x and -5x) and 36 will go to the other side 8x=76-36 8x=40 x=5 W=5ft L=10ft since L=x+5