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

Evaluate each expression for $x=-4$ and $y=2$.

$\mid 2x-5y\mid$

Evaluate each expression for x = -4 and y = 2. |-3x + 4y|

Evaluate each expression for $x=-4$ and $y=2$.

$\mid -5y+x\mid$

Evaluate each expression for x = -4 and y = 2. 2|y| - 3|x| / |xy|