1. The concentration C of a chemical in the bloodstream t hours after injection into muscle tissue is hours after injection into muscle tissue is given by
C (t) = (2t + 1) / (t2 + 4), t > 0.
(a) Determine the horizontal asymptote of the graph of the function and interpret its meaning in the context of the problem.
(b) Use a graphing utility to graph the function and approximate the time when the bloodstream concentration is greatest.
Identify the conic.
2. y2 = -10x
3. x2 + y2 / 16 = 1
4. y2 / 12 - x2 / 9 = 1
5. x2 + y2 = 20
6. 4x2 + 18y2 = 36
7. 8x2 - y2 = 48
8. 3x2 + 3y2 = 75
9. 5y = x2