Question

I'll give brainliest if you show your work. Plz answer quickly.

Answer 1

The answer is C: In step 3, he should have determined which square is closest to 18. (From Edge 2020)

D is incorrect !

I apologize, I don't have an explanation, that's what the assignment said.

Answer 2

Nolan correctly identified the square  numbers before and after 18.

The square roots of them are 4 and 5.

Clearly, square root of 18 should lie between 4 and 5 only.

He, then carefully squared 4.1, 4.2, 4.3 etc. and identified that 4.3 squared is nearer to 18.

Since, Nolan is finding estimated square root, his steps are cool and he didn't make any error.