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Hello, and thank you for posting your question here on brainly.

The square root of 91 is 9.53...

Which means, the square root of 91 falls in between the numbers 9 and 10.

Hope this helps! ☺♥
Well we know that,
10² = 100           and that
9² = 81

Therefore √91 must be in between 9 and 10