Every positive number has TWO square roots. The principal square root is the positive number which, when multiplied by itself, gives the number in question. But its negative equivalent will also be a square root.
For example, the number 4 has 2 as the principal sqrt but -2 is also a sqrt of 4
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The square root of 13 x 13 is 13. This is because the square root of a number is a value that, when multiplied by itself, gives the original number. In this case, 13 multiplied by 13 equals 169, so the square root of 169 is 13.
12 and 13
There are: 13*19 = 247 square units
If the number with the digits reversed can have a leading 0 so that it is a 1-digit number, then 16. Otherwise 13.
Yes because the square root of 169 is 13 which is a rational number