Question

Which describes Which is a perfect square?
72
81
90
99

Answer 1

Answer: 81

Step-by-step explanation:

81 can be perfectly square rooted into 9.
`√(81)=9`

Answer 2

81

Explanation:

A perfect square is multiplying a number with the same number in question. 81 is a perfect square because either 9 or -9 will go into it perfectly, like a square's length and height.

`9^(2) = 81`