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lynda.boyce

  • one year ago

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?

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  1. anonymous
    • one year ago
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    plug 1000 in for x

  2. welshfella
    • one year ago
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    you'll need a scientific calculator to do that one.

  3. lynda.boyce
    • one year ago
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    I have one, but how do I type it in?

  4. welshfella
    • one year ago
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    exactly as you've written it

  5. lynda.boyce
    • one year ago
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    I don't need to put in 2.718282 anywhere?

  6. welshfella
    • one year ago
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    no - just the e^x key

  7. lynda.boyce
    • one year ago
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    would I type in 130-.01981000e^-0.000150*1000

  8. lynda.boyce
    • one year ago
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    the answer I got was 130.00

  9. welshfella
    • one year ago
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    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

  10. welshfella
    • one year ago
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    130 is incorrect

  11. welshfella
    • one year ago
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    - you didnt put the parentheses in

  12. lynda.boyce
    • one year ago
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    27.75

  13. welshfella
    • one year ago
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    try again i got 86.45

  14. welshfella
    • one year ago
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    dont forget the negative and the parentheses

  15. lynda.boyce
    • one year ago
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    ok, I used a different calculator and got 86.4469

  16. welshfella
    • one year ago
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    yes thats right

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