Hello! I need some help with my test questions! Dr. Goodie wants to treat Mr. Mi

Hello! I need some help with my test questions!
Dr. Goodie wants to treat Mr. Miller’s thyroid cancer by using Radioactive lodine (RAI) treatment after an unsuccessful surgery to remove the cancer. Dr. Goodie explains that this treatment consists of injecting radioactive lodine (1-131) into the bloodstreamSinc the thyroid is the only place the body stores lodine, is a relatively safe way to destroy cancer cells within the thyroid. Dr. Goodie apologetically leaves to deal with an emerger Issue, but Mr. Miller still has some concerns. Answer the following to alleviate Mr. Miller concerns:
Dr. Goodie estimates Mr. Miller will need to be infused with approximately 4 grams of 131 over a 3- hour period of time to reach a sufficient therapeutic level of radiation.
1. How many grams of iodine-131 would remain in Mr. Miller’s body after 6.8 half-lives? ( Round your answers to two decimal places)
2. If the half-life of l-131 is 7.6 days, how long would it take for l-131 to go through 3.3 half-lives? (Round your answers to two decimals points)
3. If the half-life of l-131 is 29 days, how many moles of l-131 would be left in Mr. Miller’s body after 35 days if he was infused with 4.4 grams? (Round your answer to four decimal places)
4. If the half-life of l-131 is 7.8 days, how many days would it take for only 3.2 x 10^-2 grams of l-131 to be left in Mr. Miller’s body if Dr. Goodie started him on an initial dose of 7.9 grams? (Round your answer to two decimal points)
*Note that question #12 also ask the symbol but is unfortunately cut off. So please include that in your answer pls*