A rock is dropped off the top of a building 70 feet tall so that its height above the ground is modeled by h = -16 + 256. What is a reasonable domain for the time during which the ball is in the air?

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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