At one farmers market bananas cost 0.80 per pound at another farmers market bananas are sold and 5 pound bags for $4.50 per bag which explains how to find the better buy

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.