91Ó°ÊÓ

Explain why an open sentence always has at least one variable.

Determine whether each relation is a function.

Write a verbal expression for each algebraic expression.

$a^{2}b+5$

SHORT RESPONSE

Simplify:$\left[10+15\left(2^3\right)\right]÷\left[7\left(2^2\right)−2\right]$

Step 1:$[10+15(8\left)\right]÷\left[7\right(4)−2]$

Step 2:$[10+120]÷[28−2]$

Step 3:$130÷26$

Step 4:$\frac{1}{5}$

Which is the first incorrect step? Explain the error.

Evaluate each expression. (Lesson 1-2)

$5^2$

Evaluate each expression. (Lesson 1-2)

${25}^2$

Evaluate each expression. (Lesson $1-2$)

localid="1648151704699" $\frac{3â‹\dots 9^2−3^2â‹\dots 9}{3â‹\dots 9}$

Determine whether each relation is a function

CHALLENGE Find all of the solutions of $x^2+5=30$.

GEOMETRY Write an expression for the perimeter of the figure. (Lesson1-1)