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3. The fuel used by a car is defined by f(x)=3x=/80-6x+245. where x is the travelling speed in km/h. What is the most economical speed of the car? In other words, determine the speed of the car which uses the least amount of fuel.

3. The fuel used by a car is defined by f(x)=3x=/80-6x+245. where x is the travelling speed in km/h. What is the most economical speed of the car? In other words, determine the speed of the car which uses the least amount of fuel.

Algebra: Structure And Method, Book 1
Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter10: Inequalities
Section10.3: Solving Problems Involving Inequalities
Problem 14P
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3. The fuel used by a car is defined by f(x)=3x=/80-6x+245. where x is the travelling speed in km/h. What is the most economical speed of the car? in other words, determine the speed of the car which uses the least amount of fuel.
Transcribed Image Text:3. The fuel used by a car is defined by f(x)=3x=/80-6x+245. where x is the travelling speed in km/h. What is the most economical speed of the car? in other words, determine the speed of the car which uses the least amount of fuel.
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