Andrew is offered an interest rate of 7.2% from the vehicle dealer where he is buying a vehicle. Is that the same interest rate that the vehicle dealer gets from the lender it is using

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.