Recently, your company sent out a coupon using a customer list that includes 3,000 people. Your market research indicates that 90 of those people actually responded to the coupon. Absent any other info, if you send another coupon to any one customer at random, what's the probability that he or she will use the coupon

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.