91Ó°ÊÓ

In the following exercises, evaluate the following expressions.

${\left(x+y\right)}^2\mathrm{when}x=6,y=9$

Evaluate$x=3$when$x^{2}and{4}^x$

In the following exercises, evaluate the following expressions.

$a^2+b^2\mathrm{when}a=3,b=8$

Evaluate$x=6$when$x^{3}and{2}^x$

In the following exercises, evaluate the following expressions.

$r^2-s^2\mathrm{when}r=12,s=5$

Evaluate$3x^2+4x+1whenx=3$

In the following exercises, evaluate the following expressions.

$2l+2w\mathrm{when}l=15,w=12$

Name the number $17,864,325,619,004$using words.

In the following exercises, name each number using words.

$1,458,398$

Evaluate$6x^2-4x-7whenx=2$