Sanjay is comparing the cost of cell phone services. The phone he wants costs $50 at Dover Cellular, and the unlimited calling plan through their carrier would cost $3 per day. At Garrison Electronics, Sanjay could purchase the same phone for $60 and also get an unlimited calling plan for $2 per day. After some number of days, the two options would end up having the same total cost. What would the total cost be?

9sandwiches per hour

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.