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

## Answer This Question

## Related Questions

- Math - Advanced Functions - the function f(x)=-0.005x^2+0.8x+12 models the ...
- math - Your Porsche's gas mileage (in miles per gallon) is given as a function M...
- math - a car travels at a constants speed and uses G(x) litres of gas per ...
- algebra - Testers drive 8 vehicles 200 miles on a test track at the same speed. ...
- Rational Functions Word Problem - A car travels at a constant speed and burns g(...
- Physics - The first stage of a space vehicle consumed fuel and oxidizer at the ...
- Stat Help Please - A linear model can be used to describe the relationship ...
- math - A rally car traveled for 2 hours 40 minutes at an average speed of 120 km...
- Algebra - 1.A motorcycle has a reserved fuel of 0.5 liter which can be used if ...
- algebra - . If you enter Interstate 40 at mile marker 23 in Sayre, Oklahoma, how...

More Related Questions