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Math Help - scientific notation

  1. #1
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    scientific notation

    0.008/0.00002
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    Re: scientific notation

    Quote Originally Posted by Louisana1 View Post
    0.008/0.00002
    \frac{8\cdot 10^{-3}}{2\cdot 10^{-5}}=~?
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    Re: scientific notation

    4 x 10^2 right????????????
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    Re: scientific notation

    Quote Originally Posted by Louisana1 View Post
    4 x 10^2 right????????????
    Right.
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    Re: scientific notation

    750000x20000x3000
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    Re: scientific notation

    (7.5 \times 10^5)(2 \times 10^4)(3 \times 10^3) = ?
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    Re: scientific notation

    45 x 10^12 or 4.5 x 10^12
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    Re: scientific notation

    ok my teacher has an answer of 4.5 x 10^13 HOW did he get that
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    Re: scientific notation

    45 \times 10^{12} = 4.5 \times 10^1 \times 10^{12} = 4.5 \times 10^{13}
    Last edited by skeeter; September 3rd 2012 at 03:50 PM.
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    Re: scientific notation

    Quote Originally Posted by Louisana1 View Post
    45 x 10^12 or 4.5 x 10^12
    Quote Originally Posted by Louisana1 View Post
    ok my teacher has an answer of 4.5 x 10^13 HOW did he get that
    Well 45\cdot 10^{12}=4.5\cdot 10^{13}~!
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    Re: scientific notation

    So when you place the decimal between the 4.5 the exponent goes up one
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    Re: scientific notation

    Quote Originally Posted by Louisana1 View Post
    So when you place the decimal between the 4.5 the exponent goes up one
    I would hope that you learned long ago that you could multiply or divide by powers of 10 by moving the decimal point. Remember that? What is 1023.13 times 10? What is 1023.13 divided by 10?
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