A circular oil spill has a radius of 2 miles. After a day, the radius of the spill increases by 3 miles. By how many square miles does the area of the oil spill increase?

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.