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1
The base of the right prism is a hexagon composed of a rectangle and two
triangles. Find the volume of the right hexagonal prism using the formula V = Bh.
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the answer to your question is b.

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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