What do i look like a calculator? :/
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The square numbers closest to 99 and 149 are 100 (10^2) and 144 (12^2), respectively. The square number between 100 and 144 is 121 (11^2), as it falls between the square roots of 100 and 144. Thus, the square number between 99 and 149 is 121.
A number can have only one square root; for 9801, it's 99.
10000 is the square of 100 so you're looking for the square of 99 which is 9801.
99 square feet is 9.2 square meters.
Irrational: it amounts to roughly 9.949874371