lol, I remember doing this like 3 years ago
2000 = 275 x 10^(0.018t)
You have final = initial (Then all the other crap...)and that's all you really need to know.
For one that's asking for the half life of something it's practically the same way...
Say you want to find what 100g of an element will be in 6 years if the half life is every six months.
There are twelve 6-month periods in six years so you would have
Final = Initial(1/2)^12
Where the final is what your looking for, the initial is 100g (what you start with), the 1/2 is the half-life, and the 12 is the periods...
All these problems are somewhat of teh same...
I'm going to major in math so if you guys need any help