Q: Which number is seven less than twice the square root of eighty-one?

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8

6

Twice the number is something like 3x2, 4x2.... Squared is 3x3, 4x4. It's one number multiplied by itself twice

three times a number decreased by eleven

2X+7

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8

6

No it is not. A Square number is one that can be expressed as the product of the same number twice. Ex: 49 is a square number 7 * 7 or 72

Twice the number is something like 3x2, 4x2.... Squared is 3x3, 4x4. It's one number multiplied by itself twice

three times a number decreased by eleven

2X+7

666

41

2

blah

It's a square number. Square numbers have a factor pair that is the same number twice. When listed, that number occurs once.

2*24.5 = 49