65. Circulation of Blood Research conducted at a national health research project shows that the speed at which a blood cell travels in an artery depends on its distance from the center of the artery. The function v=1.19−1.87r2 models the velocity (in centimeters per second) of a cell that is r centimeters from the center of an artery.
(a) Find a graph of v that reflects values of v appropriate for this problem. Record the viewing-window dimensions.
(b) If a blood cell is traveling at 0.975cm/sec, estimate the distance the blood cell is from the center of the artery.