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1.The half-life of polonium (210Po) is 143 days. If you have 21 grams now, how much...

1.The half-life of polonium (210Po) is 143 days. If you have 21 grams now, how much wil you have at the end of 2 years? (Give your answer correct to 3 decimal places.)
  grams

2.A colony of bacteria grows according to the uninhibited growth model. Suppose there is 9 g of bacteria on Monday and 27 g of bacteria on Wednesday.

(a) Find a function that gives the amount of bacteria in grams after t days. (Use the variable a to represent the initial amount.)
A(t) =  
(b) What is the doubling time for the colony? (Round your answer to 2 decimal places.)
days

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