For his long distance phone service, Keith pays a 2 monthly fee plus 12 cents per minute. Last month, Keith's long distance bill was $14.84. For how many
minutes was neith it

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.