Terry is making 6 hat and scarf sets. Each scarf requires 3 yards of material and each hat requires 18 inches of material. How many feet of material does he need for all 6 hat and scarf sets? He will need feet of material for all 6 hat and scarf sets.

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.