Is he correct, or not?

C. His estimate is incorrect; it should be closer to 12 than 11.

Step-by-step explanation:

1. 11^2 is 121, √(140^2) is 140, and 12^2 is 144.

2. Based off these numbers 140 is closer to 144, meaning that √(140) is closer to 12 than 11.

Therefore, the correct answer is C. His estimate is incorrect; it should be closer to 12 than 11.

He is not correct

Step-by-step explanation:

He is not smart

-22

times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3