Write each power as a product of the same factor. Then find the value. 2.5^3

A) 2.5 x 2.5; 6.25
B) 2.5 x 2.5 x 2.5; 15.625
C) 2.5 x 3; 7.5
D) 2.5 x 2.5 x 2.5 x 2.5; 30.0625

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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