Joel mows his aunt's lawn for $9 per hour. If he spends $7 on gas, how many hours, x, will he need to spend mowing the lawn to have $47 left?

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.