The function y - 68 = 12(x-4) can be used to determine the cost in dollars for renting a canoe for x house. What is the rate of change of the cost in dollars with respect to the number on hours.

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.

Really any number between them works. for example 144.951

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