Dreama's Videos charges members $4 to rent each video. If you get a store membership it costs $20 and members only pay $2 to rent a video. For what number of videos is the cost 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.

100$ would be the correct answer