Yusuf signed up for a streaming music service that costs $7 per month. The service allows Yusuf to listen to unlimited music, but if he wants to download songs for offline listening, the service charges $0.50 per song. How much total money would Yusuf have to pay in a month in which he downloaded 45 songs? How much would he have to pay if he downloaded s songs? Cost for 45 songs:

Cost for s songs:

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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.