Which number is a multiple of 4/5? 8/10 , 12/15, 16/20. 12/5

It would be 2/2 which is equal to 8/10 :)

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.