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Math Help - ok whats wrong/right about this answer?

  1. #1
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    ok whats wrong/right about this answer?

    the question is hair grows about 29 in/day find the rate at which it grows in nm/sec

    so i did this 2.54 x 10^5(<--in to nm) times 29 in = 7.366 x10 ^8
    1 day = 86,400 sec

    so 7.366 x 10^8 nm/ 86,400s =8.5255 x 10^3 nm/sec

    ^correct?
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  2. #2
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    Quote Originally Posted by gabriel View Post
    the question is hair grows about 29 in/day find the rate at which it grows in nm/sec

    so i did this 2.54 x 10^5(<--in to nm) times 29 in = 7.366 x10 ^8
    1 day = 86,400 sec

    so 7.366 x 10^8 nm/ 86,400s =8.5255 x 10^3 nm/sec

    ^correct?
    Your calculations are OK

    ... though I would prefer to use the units too:

    \dfrac{29\ in \cdot 2.54 \dfrac{cm}{in} \cdot 10^7 \dfrac{nm}{cm}}{1 d \cdot 24 \dfrac{h}{d} \cdot 60\dfrac{min}{h} \cdot 60 \dfrac{s}{min}}
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  3. #3
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    i simplified it bcuz i dont know how to use the texts in this forum sorry
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