Posted by **Anonymous** on Friday, July 22, 2011 at 11:42pm.

the function f(x)= -o.005t^2+0.8t+12 models the relationship between a certain vehicleâ€™s speed and fuel economy, where is the fuel economy in kilometres per litre and x is the speed of the vehicle in kilometres per hour. Determine the rate of change in fuel economy for 10 km/h intervals in speed, and use your results to determine the speed that gives the best fuel economy.

ANSWER : 18km/h

i confused i don't understand how to solve this problem please help

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