Evaluating roots

What is the length of the side of a square whose area is $81\ in.^2$  

• 20 in.

• 8 in.

• 9 in.

Which number is not a perfect square?

• 100

• 49

• 117

• 144

What is the square root of 121

• 15

• 7

• 11

• 12

The √225 is ?

• Irrational

• Rational

11² is equal to

• 121

• 22

√144

• 4√2

• 4

• 12

• 4√5

√49

4²