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is3535

  • one year ago

help

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  1. is3535
    • one year ago
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    @welshfella

  2. is3535
    • one year ago
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    3x10^20/4x10^5

  3. welshfella
    • one year ago
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    ok what is 3 divided by 4 as a decimal

  4. welshfella
    • one year ago
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    you can do that with your calculator

  5. is3535
    • one year ago
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    0.75

  6. is3535
    • one year ago
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    and what is |dw:1442265028567:dw|

  7. welshfella
    • one year ago
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    right now we divide the '10' parts

  8. welshfella
    • one year ago
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    = 10^(20-5)

  9. is3535
    • one year ago
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    |dw:1442265065805:dw|

  10. welshfella
    • one year ago
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    when dividing you subtract the exponents

  11. is3535
    • one year ago
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    |dw:1442265165234:dw|

  12. welshfella
    • one year ago
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    all you need to is work out 20-5 and that's the new exponent of 10

  13. welshfella
    • one year ago
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    right good but that is not scientific notation because the first number is not between 1 and 10 so to get it to the required value we multiply 0.75 by 10 to give 7.5

  14. welshfella
    • one year ago
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    but 7.5 * 10^15 is not the correct answer - Its 10 times too much agreed?

  15. welshfella
    • one year ago
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    we have multiplied by 10 so that makes the whole scientific number 10 times great

  16. welshfella
    • one year ago
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    * greater

  17. is3535
    • one year ago
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    i think it is 7.5 X 10^15

  18. welshfella
    • one year ago
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    no it cant be because 0.75 x 10^15 is not equal to 7.5 * 10^15 that is like saying 58 = 580

  19. is3535
    • one year ago
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    oh ok

  20. welshfella
    • one year ago
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    So to maintain the same value as we multiplied the first part by 10 we have to divide the second part by 10 10^15 / 10^1 = 10^14

  21. welshfella
    • one year ago
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    so the correct answer is 7.5 * 10^14

  22. welshfella
    • one year ago
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    did you follow the argument ok?

  23. is3535
    • one year ago
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    ok 1 more plzz

  24. welshfella
    • one year ago
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    I can't I'm sorry . I have to go and pick up my grandkids

  25. is3535
    • one year ago
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    ok

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