How do i solve this problem? ? i don't understand.

There asking what you think the square root of 392 is( square root is when two of the same numbers multiply to get that number, in this case you would be finding the two multiples of the same number for 392)(if you need more help ask me)

I know this! You have to get the square root of the numbers that are perfect squares below and above this number,  and then you have to estimate the square root based on the square roots of the other two numbers by using logic.