91Ó°ÊÓ

Evaluate each expression if $g=2$, $r=3$and $t=11$.

$7−gr$

Example 3 Determine whether each relation is a function.

$y=3x−2$

Find the following quotient.

$\frac{2}{3}÷\frac{1}{3}$

Determine whether each relation is a function.

$y=3x+2y$

Evaluate each expression if $g=2$, $r=3$and $t=11$.

$r^2+{\left(g^3−8\right)}^5$

Example 4 Find a counterexample for each conditional statement.

If you live in London, then you live in England.

Evaluate each expression using properties of numbers. Name the property used in each step.

$18+41+32+9$

The simplified form of $43.2+\left(-27.9\right)$.

Find each product or quotient. Write in simplest form.

$−\frac{7}{8}â‹\dots 2$

Estimate each square root to the nearest whole number.

$\sqrt{31}$