Can someone please help me? :)

I’m not sure how this works

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

How much is 32 out of 40 written as a percentage? convert fraction (ratio) 32 / 40 answer:   80%