Consider the amount of gas in your car during a road trip. You start out with 45 gallons and drive for 4 hours, leaving you with 27 gallons in the tank. You stop for lunch for 2 hours and then drive for 2 more hours, leaving you with 18 gallons.
t= time
C (t)=_____ if 0 </ t </ 4
C (t)=_____ if 4 < t </ 6
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