Trusted car rental company charges a fee of $20 per day, plus $0.20 per mile. zippy car rental company charges $30 per day, plus $0.15 per mile. if john needs a car for 2 days, how many miles would he have to drive for the cost of the cars to be the same price?

It says in the questions that it is 6.5?

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.