Problem page customers of a phone company can choose between two service plans for long distance calls. the first plan has a $16 monthly fee and charges an additional $0.07 for each minute of calls. the second plan has a $12 monthly fee and charges an additional $0.11 for each minute of calls. for how many minutes of calls will the costs of the two plans be equal?

If their call lasts 11 minutes the cost will be the same

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.