Please answer the questions below asap

Question 9 A drug is administered every 4 hours in dose of 10 mg. The drug is neutralized at an exponential rate with decay rate constant k = 0.1. Not all the drug is neutralized before the next dose is administered. Let - A(t): denote the amount of drug in the patient's system at time t hours, o 3\": denote the amount of drug in the patient at the beginning of the n+1 dosage interval, and - Rn: denote the residual amount of the drug left in the patent at the end of the nth dosage interval. Note: The general form of the Exponential decay Model is A(t) = Agel\" where: 0 A0: denote the initial amount presented at time t = 0. o k: denote the decay rate (unit: Utime) - A(t): denote the amount left at time t The formula for the function A(t) over the second dose periods is: O a) A(t) = 103'0'1' O bl A(t) = (10 + 10e'1-2)e'0-1\"'3) O C) AU) = 10e'1'2e'0'1("4) 0 d) AU) = (10 + 10e'1-5)e'-\"\"3) O 9' A0) = (10 + 10e0-4)e-1('-4) O f) None of the above Question 18 The derivative of the function f (x) = of 44142 (x+1 ) is Oa) -(er)+24) er)+2x ) (3x3+2) + (x+1)* Ob) -)+4142 (344842 ) (3x 3) + (x+1) (+ 344x42 ) (3x3+4) + (x+1) (x+1) O d) -2 ( er) text2 ) (ex#+41+2 ) (3x 3+4 ) + (x+1) (x+1) O e) None of the above