Square Roots and Cube Roots

 $\sqrt{16}=?$  

• 8

• 2

• 4

• 32

 $9^2=18$  True or false?

• True

• False

 $-\sqrt{144}$  

• 12

• -12

• -72

• none of the above (imaginary number) 

 $\sqrt{-144}$  

• 12

• -12

• 72

• none of the above (imaginary number)

 $3_{\sqrt{8}}$    (cube root of 8) 

• 2

•  $\pm2$  

• -2

• None of the above 

The area of a square painting is 81  $cm^2$  . What is the length of one side?

• 9

• -9

• 40.5

• -40.5

 $\sqrt{\left(\frac{16}{81}\right)}\ \ =\ ?$  

•  $\frac{8}{27}$  

•  $\frac{8}{9}$  

•  $\frac{4}{9}$  

•  $\frac{4}{3}$  

Select the set with all perfect squares.

• -144, 9, 50, 75, 81, 100

• 9, 50, 81, 100

• 9, 50, 75, 81, 100

• 9, 81, 100

Which of the following is irrational?

• $\sqrt{49}$

• $\sqrt{50}$

• $\sqrt{81}$

• $\sqrt{121}$

What does this symbol represent?

• square root

• divide by 2

• cube root

• greater than or less than