please answer to question A,B in the attachment file...

A doctnr prescribes a ZOO-mg antlblntlc tablet to be taken every eight hours. Just before each tablet Is taken, 20% of the drug present In the preceding tlme step remains In the body. (a) How much of the drug Is In the body just after the second tablet ls taken? mg How much of the drug Is In the body just after the thIrd tablet is taken? "19 (b) IF (2,, Is the quantity of the antibiotic In the body Just after the nth tablet is taken, write a dIFFerence equatIen that expresses Q" + 1 In terms of Q\". Qn+1 = (c) Find a formula for Q\" as a functlon ofn. Ga: (d) What quantIty of the antlblotIc remains in the body in the long run? "19 The Michaelis-Menten equation models the rate v of an enzymatic reaction as a function of the concentration [S] of a substrate 3. In the case of the enzyme chyrnotrvpsin the equation is V = o.29[5] 0.014 + [51' (a) What Is the horizontal asymptote ofthe graph of V? What is its signicance? As the concentration 'i'elect a , the enzymatic reaction rate will approach