Anybody good with calculus? Derivatives..

RyanGT · November 4th, 2008, 06:19 PM

Originally Posted by AnimalCrackers

I may be just forgetting things, but I was pretty sure what I entered first was correct. The exponential value should not change at all, and the derivative of 48.1/t is -48.1/t^2

If the original equation was 10,000 ( 6.7e^(48.1/t)) - 200t + 1000 then the first derivative is 67,000 * -48.1/t^2 * e^(48.1/t) - 200

and that answer is verified by my calculator and faleen's calculator, might want to double check with your teacher.

Original equation is 10,000 ( 6.7e^(-48.1/t)) - 200t + 1000. I might have wrote it down wrong in first post. I put it in both ways on excel graph and lined up data. With it the way you first posted It was in the billions of dollars (very high up that it was a number then e^27). Without negative in the first exponent it was a realistic number and had a profit slope.

Its also a profit function. Doesn't really make a huge difference, but business calc has a little bit different application and you have to interpret a bit. Or something... lol

Luis_GT · November 4th, 2008, 06:23 PM

yeah... you wrote it wrong...

RavensChild · November 4th, 2008, 06:24 PM

im doing calc now as a senior. I am close to dropping at semester because of this shit getting pretty damn hard. I am so lost on the chapter we are on. Derivatives are ok, but when you keep going farther and farther in depth it sucks

Luis_GT · November 4th, 2008, 06:25 PM

derivatives is easy pie... wait till you hit integrals by parts and series... thats a lot of fun...

oh, and the rotations suck ass

AnimalCrackers · November 4th, 2008, 06:31 PM

Originally Posted by RyanGT

Original equation is 10,000 ( 6.7e^(-48.1/t)) - 200t + 1000. I might have wrote it down wrong in first post. I put it in both ways on excel graph and lined up data. With it the way you first posted It was in the billions of dollars (very high up that it was a number then e^27). Without negative in the first exponent it was a realistic number and had a profit slope.

Its also a profit function. Doesn't really make a huge difference, but business calc has a little bit different application and you have to interpret a bit. Or something... lol

yea, with that negative up top to start with it makes more sense, otherwise it's an infinite function instead of a decaying function.

RyanGT · November 4th, 2008, 06:50 PM

Cool, thanks for the help!

November 4th, 2008, 06:50 PM	#86
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,258 iTrader: 4 reviews	Cool, thanks for the help! __________________ 2000 Black convertible GT: KB 15psi, and other goodies... 1971 Datsun 240 z: Header and rebuilt motor. (The DD)

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November 4th, 2008, 06:23 PM	#82
Luis_GT Banned 2002 BMW 530i don't know and don't care Join Date: Mar 2007 Posts: 5,180 iTrader: 0 reviews	yeah... you wrote it wrong...

November 4th, 2008, 06:25 PM	#84
Luis_GT Banned 2002 BMW 530i don't know and don't care Join Date: Mar 2007 Posts: 5,180 iTrader: 0 reviews	derivatives is easy pie... wait till you hit integrals by parts and series... thats a lot of fun... oh, and the rotations suck ass

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