9
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7, because multiplying the same sqaure root cancels them.
No. 81 is a rational number. An irrational number is a number with an endless amount of digits like pi or the square root of 2.
49 11,4,9,25,100
The square root of -81 is an imaginary number, specifically 9i, where i represents the imaginary unit equal to the square root of -1. Since the square root of -81 does not result in a real number, it is considered irrational. Rational numbers are those that can be expressed as a ratio of two integers, whereas irrational numbers cannot be expressed in this form.
The square root of 94 would lie between 9 (9x9=81) and 10 (10x10=100).