A study of air quality in a particular city by an environmental group suggests that t years from now the level of carbon monoxide, in parts per million, in the air will be a=0.2t2+0.01t+5.1.

a. What is the level, in part per million, now? [Hint: if t is years from now, what is t right now?]

b. How many years from now will the level of carbon monoxide be at 8 parts per million? Round to the nearest tenth.