Let C be the concentration. in mg per liter, of a drug in the blood as a function ofx, the amount, in mg, of the drug given and I. the time in hours since the injection. Port) 5 x 5 43nd t Z 0. we have C = f(x, t) = teatsx) . Graph f (4, t) and explain its signicance in terms of drug concentration. ll n .l I]. D l 0'0 1 2 3 4' o 1 z a 1: o I 1 3 1 : 3 4' The correct sketch is The function f(4, I) shows the drug's concentration resulting from a n 0.0733 mg injection