b. If 25% of the woods carbon remains, how old is the wood? Explain how you can find this result without using an equation?
My answer: I would take half of the 5730 =2865 and then add it to the original 5730 to get 8595
10% is roughly a half of 25% so my original estimate would be around another half life added to the previous one.
c. If 10% of the woods carbon-14 remains, how old is the wood? First guess an approximate age without solving an equation. Explain how you decided on your estimate. Then, use an equation to find the result.
My answer is to take 10% of 5730 and add it to 8595?