What I four fifths of 30 ?

4 fifths of 30 is 24 because if you divide 30 by 5 it is 6 and is you multiply 6 by 4 you get 24

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.