Mathematics 121 8. (12 points) A patient receives an injection of 1.2 milligrams of a drug, and the amount remaining in the bloodstream t hours later...

I need help on question 8. Both a and B part. Please explain it as you are solving it. Thank you

Mathematics 1218. (12 points) A patient receives an injection of 1.2 milligrams of a drug, and the amount remaining in thebloodstream t hours later is A(t) = 1.2e-0.05t. Find the instantaneous rate of change of this amount.(a) just after the injection (at time t = 0).(b) after 2 hours.