The following graph shows the radioactive decay curve for lodine-131. This radioisotope is used in medicine to help diagnose issues with the thyroid such as cancer and hyperthyroidism. Use the graph to answer the following questions. Do not include units in your answers. Percent of Iodine-131 Remaining 100 O Decay of Iodine-131 16 24 32 Number of Days a. What percent of the isotope remains after 32 days? b. What is the half-life of lodine-131 in days? c. A patient administered 20 mg of iodine-131. How many mg of this radioactive isotope will remain the body after 24 days?