A research assistant macle 160 mg of radioactive sodium (Na24) and found that there was only 20 mg lelt 45 h later.
1. What is the half-life of Na24?
b. Find a function that models the amount A left after i hours.
c. li the laboratory requires 100 mg of Na24 12 h from now. how much Na24
should the research assistant make now? (Ignore the 20 mg she currently
bas.)
d. How much of the original 20 mg would be left in 12 h?