An estimate for -^66 is

Question

A. -6
B. -7
C. -8
D. -9

I'm not sure How to do this problem?

Answer 1

If you mean -√66, just think a minute:

√36 = 6
√49 = 7
√64 = 8
√81 = 9

66 is close to 64, so √66 is close to 8

But, you have -√66, so C looks good to me.

Answer 2

Thanks