Elliot participated in a walk-a-thon in which each mile walked raised $10 for charity. His goal was to raise at least $200 on Saturday and Sunday. He raised $50 on Saturday. Which graph shows all of the distances, in miles, that Elliot could have walked on Sunday to reach his goal?

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.