Katelyn wants to buy a new cell phone. She decides to buy an iPhone 8 for a price of $449.99. She joins a plan with T-Mobile that will cost $55.35 per month for unlimited. Which of the following functions models the cost per year over the lifetime of the phone, C(n), in terms of the number of years, n, that she owns the phone?

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.

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