Please help me answer all of them correctly. Please help me answer all of them. I would appreciate it, this is my last c

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Please help me answer all of them correctly. Please help me
answer all of them. I would appreciate it, this is my last chance,
please. Check it, carefully, please.
1.a.

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1.b.

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1.c.

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Carbon-14 is used in radiocarbon dating. The half-life of carbon-14 is 5.73x103 years. How many milligrams of a 91.8 milligram sample of carbon-14 will be lost by radioactive decay during 2.292x104 years? mg

Nitrogen-13 is used in tracers injected into the bloodstream for positron emission tomography (PET). The half-life of nitrogen-13 is 10.0 minutes. How many milligrams of a 69.7 milligram sample of nitrogen-13 will be lost by radioactive decay during 60.0 minutes? mg

Carbon-14 is used in radiocarbon dating. The half-life of carbon-14 is 5.73x103 years. If you begin with 88.5 milligrams of carbon-14, how many milligrams will you have left after 1.719x104 years have passed? mg