On a map of North Carolina. the distance between Raleigh and Charlotte is 3 1/4 inches. The scale on the map is 1 inch= 40 miles. What is the actual distance?

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.