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 Challenge
 Constant of proportionality:  The constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the constant of proportionality

Hot Air Balloons: Determine the height of a hot air balloon over time based on a recursive condition.

Gretel's Goldfish: When will Hansel and Gretel have the same number of goldfish?

Bouncing Ball: Determine how high a ball rebounds with each bounce.