The following table shows the fuel efficiency (In miles per gallon) of a car in relation to the speed that it is traveling (In miles per hour).
Speed Fuel Efficiency
15
20.4
25
27.2
35
28.3
45
29.0
55
30.1
65
27.6
75
23.1
Use a graphing or online regression calculator to find the quadratic function of best fit for this set of data. Then, predict
the approximate fuel efficiency of this car when it is traveling 80 miles per hour.