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anonymous

  • one year ago

A certain forest covers an area of 4200km2. Suppose that each year this area decreases by 5.5%. What will the area be after 12 years?

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  1. campbell_st
    • one year ago
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    are you working on sequences and series...?

  2. anonymous
    • one year ago
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    idk @campbell_st

  3. campbell_st
    • one year ago
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    ok... makes it hard to explain, if you don't know. do you know how to use the compound interest formula..?

  4. anonymous
    • one year ago
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    yes but i need it to decrease and idk how to do that one @campbell_st

  5. Mertsj
    • one year ago
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    https://answers.yahoo.com/question/index?qid=20110221061524AAmXzyY

  6. campbell_st
    • one year ago
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    ok... so the compound interest formula can be converted to a depreciation formula by changing the sign inside the brackets from + to -

  7. campbell_st
    • one year ago
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    the formula I know is \[A = P(1 + \frac{r}{100})^n\] you can use \[A = P(1 - \frac{r}{100})^n\]

  8. campbell_st
    • one year ago
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    r = 5.5 P = 4200 and n = 12 hope it helps

  9. anonymous
    • one year ago
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    thank you i will try it @campbell_st

  10. anonymous
    • one year ago
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    i cant get it right @campbell_st

  11. campbell_st
    • one year ago
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    why, what do you get as an answer..?

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