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anonymous

  • one year ago

help!

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  1. anonymous
    • one year ago
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    In an average year America is responsible for about 20,000 kilograms of carbon emission pollution each year. Express this number as a single-digit integer times a power of 10.

  2. jim_thompson5910
    • one year ago
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    place a decimal point between the first two digits so we have `2.0`

  3. jim_thompson5910
    • one year ago
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    how many places must we move the decimal point to go from `2.0` to `20,000` ?

  4. anonymous
    • one year ago
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    4?

  5. jim_thompson5910
    • one year ago
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    yes, we move the decimal point \(\LARGE \color{red}{4}\) spots to the right, so the exponent over the 10 is \(\LARGE \color{red}{4}\) meaning that \[\LARGE 20,000 = 2.0 \times 10^{\color{red}{4}}\]

  6. jim_thompson5910
    • one year ago
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    if we move the decimal point to the left, then the exponent would have been negative

  7. anonymous
    • one year ago
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    so the answer is 10^4?

  8. jim_thompson5910
    • one year ago
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    I just showed you the answer

  9. anonymous
    • one year ago
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    1.0 x 10^4

  10. jim_thompson5910
    • one year ago
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    |dw:1443829908625:dw|

  11. jim_thompson5910
    • one year ago
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    |dw:1443829923670:dw|

  12. jim_thompson5910
    • one year ago
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    |dw:1443829935744:dw|

  13. jim_thompson5910
    • one year ago
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    |dw:1443829953929:dw|

  14. jim_thompson5910
    • one year ago
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    since 2.0 is really the same as 2

  15. anonymous
    • one year ago
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    ok thank you

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