2x^3+x^2-15x factored completely would be: <em>x(x+3)(2x-5).</em> Not sure which answer choice but I hope that I was some help.
Since the ratio of sides is 4 to 3, the proportion is:
![\frac{4}{3} = \frac{12}{x}](https://tex.z-dn.net/?f=%20%5Cfrac%7B4%7D%7B3%7D%20%3D%20%5Cfrac%7B12%7D%7Bx%7D%20)
x =
9
6+1x= 7 ::::::::::::::::::::::::::::::::::
120 ways. More details in attachment.