Dogde Caliber

The petrol kilometers M (unit: kilometers per liter) of the Dodge Caliber car is modeled by the function:


What is the car's best petrol kilometers, and what speed is attained?

Correct answer:

M =  32 km/l
s =  42 km/h

Step-by-step explanation:

M(s) =  1/28s2 + 3s 31 M =sd M(s) = 2/28s + 3  M=0 2/28s + 3 = 0  s=3 28/2=42 km/h  M=1/28 s2+3 s31=1/28 422+3 4231=32 km/l

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