53. PHYSIOLOGY Scientists determined that the rate y (in calories per minuta at which you use energy while walking can be modeled by
y = 0.00849(x – 90.2)2 + 51.3, 50 < x < 150
where x is your walking speed (in meters per minute). Graph the function on the
given domain. Describe how energy use changes as walking speed increases.
What speed minimizes energy use? Source: Bioenergetics and Growth