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anonymous

  • one year ago

Can someone please help? The circumference of the Earth is approximately 131,000,000 ft. a. Write this number in scientific notation and tell how you knew whether to use a positive or a negative exponent. b. The circumference of Mars is 7.00 x 107. Which planet is larger, and by how many feet? Write the answer in both standard and scientific notation.

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  1. anonymous
    • one year ago
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    In scientific notation there can only be 1 number left of the decimal point. Your decimal point is at the end of the number. How many spots must it move and in what direction to get it behind the first 1?

  2. anonymous
    • one year ago
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    6 times

  3. anonymous
    • one year ago
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    no, if you move it 6 times there will be 3 digits left of decimal. |dw:1441997504656:dw|

  4. anonymous
    • one year ago
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    8 times

  5. anonymous
    • one year ago
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    okay

  6. anonymous
    • one year ago
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    \[1.31 \times 10^{8}\]

  7. anonymous
    • one year ago
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    do you understand?

  8. anonymous
    • one year ago
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    yes I do

  9. anonymous
    • one year ago
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    for part b you just have to subtract the numbers

  10. anonymous
    • one year ago
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    okay

  11. anonymous
    • one year ago
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    -9999993

  12. anonymous
    • one year ago
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    subtract the number from b from the number in a \(7 \times 10^7\) is the same as 70,000,000 so do \(131,000,000-70,000,000\)

  13. anonymous
    • one year ago
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    61,000,000

  14. anonymous
    • one year ago
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    yeah that's the answer in standard notation. How would you write it in scientific notation?

  15. anonymous
    • one year ago
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    fyi this page has notes on converting between standard and scientific notations, as well as an applet that does it for you https://www.mathsisfun.com/numbers/scientific-notation.html

  16. anonymous
    • one year ago
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    6.1 x 10^7

  17. anonymous
    • one year ago
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    that's right

  18. anonymous
    • one year ago
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    okay thank you

  19. anonymous
    • one year ago
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    you're welcome

  20. anonymous
    • one year ago
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    Goodbye, for now

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