Simplify the expression:
$3x^2+9x+10x^2+5y+(-11x)$
$11x^2+5y$
$13x^2-2x+5y$
$15x^2+5y$
$13x^2+2x-5y$
Solve for k : $A = \frac{5k}{7y}$
$k= \frac{7}{5Ay}$
$k= \frac{5Ay}{7}$
$k= \frac{7Ay}{5}$
$k= \frac{5y}{7A}$
$k= \frac{5A}{7y}$
