Mandy spent an hour and fifteen minutes walking three miles. The next day, she
walked for % hour at the same rate. How
far did she travel?

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.

I'm not sure sorry that i couldn't