Algebra
# Properties of Arithmetic

If $(x+5)(3x + 8) = Ax^2 + Bx + C$, what is the sum of $A$, $B$, and $C$?

What is the coefficient of $y$ in the expansion of the expression $(4x-y+4)(x+2y-1) ?$

Simplify $\left( 9xy - 6y^2 + 15y \right) \div 3y.$