going into the final exam, which will count as ¼ of the final grade, haley has test scores of 85, 92, 93, 86, 88, and 90. what score does haley need on the final exam in order to have an average of 90?

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.