7. The concentration C of a drug in a patient's bloodstream t hours after it was injected is given by [points 5] 0.212 C(t) = 3 + 312 + 20 (a ) Find lim C(t). [b) Interpret the result in (a ]. P(x)- 8. Let P be a polynomial, we have lim P(x) = 2, and lim -= 1, find P(x). [points 5]5. For each of the following, find the limit if it exists. [points 10] {f ). lim - 1 - 1 (g). lim 1+x- 1 {h). lim vi+ x- vi+x (i). lim my*+x-2 (ij. lim * - 1 MK-x+2 6.Calaulate [points 6] 1 - cosx lim -2