To visualise √7 on a number line you'd have to approximate it - √7 is in exact (surd) form as it is not a whole number. The approximation or decimal form of √7 is roughly 2.65. Or if you prefer, 2.6457513110645905905016157536393. So on a number line, place it between 2 and 3.
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It is: the square root of 7 times the square root of 7 = 7
the square root of 49 equals 7
no, 28 has no whole square root; the square root of 49 is 7
between what two square root of integers is Eulers number
7^2 or 49.