If you have 10 g of a substance that the keys with the half-life of 14 days then how much will you have after 42 days? 1.25 3.13 2.50 6.25

Its 1.25g, you can see how many 14 day trials are in 42 days with division. Then you will find its 3. So you use the half life equation (t1/2)

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is