Question 24350
1) Multiply:
{{{(5-6y)(3y^2-y-7)}}} = {{{15y^2-5y-35-18y^3+6y^2+42y}}} = {{{-18y^3+21y^2+37y-35}}}

2)
A = L*W  But Length is x feet and Width = (x+4) feet, so:
{{{A = x(x+4)}}}
{{{A = x^2+4x}}} This is the polynomial.

If x = 10 ft., then:
{{{A = 10^2 + 4(10)}}}
{{{A = 100 + 40}}}
{{{A = 140}}}sq.ft. This is the area.