For the following exercises, use this scenario: A tumor is injected with 0.5 grams of Iodine-125, which has a decay rate of 1.15% per day. 32 Write an exponential model representing the amount of Iodine-125 remaining in the tumor after t days. Then use the formula to nd the amount of Iodine-125 that would remain in the tumor after 60 days. Round to the nearest tenth of a gram. 34. The half-life of Radium-226 is 1590 years. What is the annual decayr rate? Express the decimal result to four signicant digits and the percentage to two signicant digits. 36. A wooden artifact from an archeological dig contains 60 percent of the carbon-l4 that is present in living trees. To the nearest year. about how many years old is the artifact? (The half-life of carbon- 14 is 5730 years.)