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Bismuth-210 has a half-life of 5 days. The initial sample's mass is 400mg. i) Find a formula to express the mass m(t) after t days.

Bismuth-210 has a half-life of 5 days. The initial sample's mass is 400mg.

i) Find a formula to express the mass m(t) after t days.

ii) What is the mass of Bismuth-210 after 13 days?

iii) After how many days will the sample be reduced to 40mg?

Any help will be greatly appreciated, thank you!

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