NEED ANSWER ASAP PLEASE

In some individuals, the thyroid does not produce enough hormone, so these individuals may take a replacement hormone, such as thyroxone. The concentration C(t) of thyroxone (in micrograms) in the person's body decays exponentially with a half -life of about seven days. Consider an individual who has taken 120 mcg of thyroxone. a) (1 point) Which of the following is true for the concentration of the drug in the individual's body? 0 After 14 days, none of the hormone remains 0 After 14 days, 30 mcg remains 0 After 14 days, 119 mcg remains 0 After 14 days, 106 mcg remains b) [3 points) The thyroxone concentration (in mcg} can be modeled by C(t) = 12080399:, where t is the time in days after the individual has taken the drug. When will the concentration be 12 mcg? Round your answer to the nearest day. :i