I need math homework help with the problem below

Question

1. Studies show that the minimum half-life of Phenytoin is 12 hours.Use the following to construct a function that will model the minimum amount of Phenytoin left in the body after an initial dose of 15 mg.Where  describes the amount of Phenytoin left in the body after  hours following an initial dose of  mg.
2.  
3. How long (in hours) will it take for the amount of Phenytoin left in the body to reach 6 mg?
4. and 
5. Research shows that the radioactive isotope Plutonium-238 has a half-life of 87.7 yearsUse the following to construct a function that will model the amount of Plutonium-238 remaining after  years, from an initial amount of 40 kg.Where  describes the amount of Plutonium-238 remaining after  years from an initial quantity of  kg.
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Answer 1

Q(t) = 15(0.5)^t/12

Q(t) = 40(0.5)^t/87.7

Do you see a pattern?