How many days have passed if 19.2 mg of calcium-47 decayed to 1.2 mg of calcium-47?

This is a problem involving half-lives. We can solve this problem by using the equation as shown: A=Aoe^-(ln2/t)T where A is the final amount (1.2milligram), Ao is the initial amount (19.2mg), t is the half-life (4.5 days) and lastly T time elapsed (required). Plug in the values in the equation and you should get  18 days. Eighteen days have passed.

odds are decent that your handwriting right now looks a little bit different than it did five years ago, and will look different again in five more. when i look back through my notebooks from middle school to now, i see a long, slow progression from meticulous and teeny letters to bigger, sloppier ones, plus a few side detours: sometime in high school, for example, i decided those loopy cursive lowercase f’s were just the coolest, adopting them as the lone rep for cursive in my otherwise all-print handwriting.

explanation:

c. is the answer

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