Use the laws of logarithms to evaluate. b) log,77 47) Bismuth is used in making chemical alloys, medicine, and transistors. A 10-mg sample of bismuth-214 decays to 9 mg in 3 min. a) Determine the half-life of bismuth-214. b) How much bismuth-214 remains after 10 min? d Graph the amount of bismuth-214 remaining as a function of time. d) Describe how the graph would change if the half-life were shorter. Give reasons for your answer.