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[CIE] All Pure Mathematics (P1, P2 and P3) doubts here !

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astarmathsandphysics:
One mo.

astarmathsandphysics:
here

curiousguy:
9709/13/m/j/10 Q8 (iii) please someone explain me this question.

Most UniQue™:

--- Quote from: astarmathsandphysics on October 30, 2011, 10:04:38 pm ---here

--- End quote ---

Thanks a lot sir!

urni.nath:
I have a doubt:
At a speed of S km per hour a car will travel y kilometers on each litre of petrol,where
y= 5 + 1/5 S - 1/800 S^2
Calculate the speed at which the car should be driven for maximum economy.

Any help is appreciated!
Thanks

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