If the square root of 10 less than a certain number is 1, what is the number?
That is a good answer radio.
you can set it up as an equation if you want.
$$\\\sqrt{x-10}=1\qquad $ Now square both sides$\\\\x-10=1\\\\x=11$$
11
The only number that factorises into 1 is 1 because 1x1=1
1 + 10 = 11, so 10 less than 11 rooted is 1