What is the simplest form of RootIndex 4 StartRoot 81 x Superscript 8 Baseline y Superscript 5 Baseline EndRoot? 3 x squared (RootIndex 4 StartRoot y Superscript 5 EndRoot

3 x squared y (RootIndex 4 StartRoot y EndRoot)

9 x squared y (RootIndex 4 StartRoot y EndRoot)

9 x Superscript 4 Baseline y squared (RootIndex 4 StartRoot y EndRoot)

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B IS WRONG

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step-by-step explanation:

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b.   e = 7.5h

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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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