Sean is filling his truck with gasoline. He knows the total cost, c, will be proportional to the number of gallons of gasoline, g, that he puts into the gas tank. After putting 8.5 gallons in the tank, the cost is $23.63.

The answer is e &

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.