Trina ran and biked a total of 34miles in 3.5hours her average running speed was 6mph and her average biking speed was 12.5mph how many hours did she run? how many hours did she walk?

You should add the speed of the miles they ran in all

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.