book Maths Puzzle Numerical Ability

I have been out of school for about 6 years now, and my algebra is pretty rusty. I'm trying to help my sister with her college algebra homework, and I can't remember how to work a

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On planet X, an object falls 18 feet in 3 seconds. Knowing the distance it falls varies directly with the square of the time of fall, how long does it take an object to fall 100 feet? Round to three decimal places, if necessary. What is the degree of the polynomial 12xy^3-7y^2z^5+5x^6y-2X^2y^2