Simplify

$-13+4x+x\(\left\)(9-x\(\right\))$

Simplify

$3x+14y-7\(\left\)(-x+2y\(\right\))$

Evaluate each expression for p=-4, q=8, and r=-10. -p² -7q +r²

Answer each question. If the lengths of the sides of a cube are tripled, by what factor will the volume change?

Simplify each expression. (3/4r)(-12)

Simplify each expression. 8+(a+7)

Simplify each expression. $-\(\frac{1}{4}\)(20m + 8y - 32z)$

Rewrite each expression using the distributive property and simplify, if possible. 15x-10x