please answer and explain tia

Use the following information to answer the next question. The volume of air flowing into the lungs during a breath can be represented by the polynomial function V(t) = -0.041t3 + 0.181t2 + 0.202t, where V is the volume in litres and t is the time in seconds. 20. a) What is the maximum volume, to the nearest hundredth, of air inhaled into the lung? Show a sketch. [2 Marks] b) How many seconds, to the nearest hundredth, does it take to complete 1 breath? [1 Mark]