Lamar will rent a car for the weekend. He can choose one of two plans. The first plan has an initial fee of 46 and costs an additional 0.13 per mile driven. The second plan has an initial fee of 51 and costs an additional per mile driven.

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.