I am lost with this question, do you mind helping me throught the entire Q. Thanks! #18

The graph describes a bicycle racer's distance from a roadside television camera. a) When is the bicyclist's velocity the greatest? How can you toll? b) Is the bicydist's acceleration positive or negative? How can you tell? 20 40 69 80 180 120 140 160 Time In second) a) The velocity is greatest at time because the slope of the tangent line is there b) The acceleration is because the slopes of the tangent lines stay the same are increasing are decreasing