91Ó°ÊÓ

Explain why the absolute value of a number is always nonnegative, $\left|a\right|$can equal $-a$.

Find the value of each expression.

$18-12÷3$

Write an equation whose solution is $-7$.

Solve each equation. Check your solution

$\left|a-9\right|=20$

Solve each inequality. Describe the solution set using set-builder or interval notation. Then graph the solution set on number line.

10. $\frac{n}{12}+15≤13$

Identify the additive inverse and multiplicative inverse for each number

10. $-8$

Name the sets of numbers to which each number belongs.

$\sqrt{\mathbf{17}}$

Evaluate each expression if$x=4,y=−2,$ and$z=6$

10. $z-x+y$

Solve each equation. Check your solution.

$y+14=-7$

Simplify $4\left(14x-10y\right)-6\left(x+4y\right)$