Achild with a fixed amount of money can buy 2 bags of chips and 5 cans of pop,
or 3 bags of chips and 2 cans of pop. a linear relationship exists between the number
of bags of chips, x, and the number of cans of pop, y, which can be bought.
a) write the coordinates of two points which lie on the graph of this linear relationship.
b) determine the equation of the linear relationship.

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ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

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