lynda.boyce
  • lynda.boyce
What is the rate of change of the revenue when there are 1000 downloads. So far I have R'(1000) = (130 - .019(1000))e^(-.000250(1000)). How do I calculate to get the answer?
Mathematics
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
plug 1000 in for x
welshfella
  • welshfella
you'll need a scientific calculator to do that one.
lynda.boyce
  • lynda.boyce
I have one, but how do I type it in?

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welshfella
  • welshfella
exactly as you've written it
lynda.boyce
  • lynda.boyce
I don't need to put in 2.718282 anywhere?
welshfella
  • welshfella
no - just the e^x key
lynda.boyce
  • lynda.boyce
would I type in 130-.01981000e^-0.000150*1000
lynda.boyce
  • lynda.boyce
the answer I got was 130.00
welshfella
  • welshfella
well you can simplify it by doing some of it manually first 130 - .019*1000 = 130 - 19 = 111 and the exponent of e = 0.000250*1000 = 0.25 so it boils down to 111* e^(-0.25) try that one
welshfella
  • welshfella
130 is incorrect
welshfella
  • welshfella
- you didnt put the parentheses in
lynda.boyce
  • lynda.boyce
27.75
welshfella
  • welshfella
try again i got 86.45
welshfella
  • welshfella
dont forget the negative and the parentheses
lynda.boyce
  • lynda.boyce
ok, I used a different calculator and got 86.4469
welshfella
  • welshfella
yes thats right

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