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Math Help - integer exponents

  1. #1
    Junior Member
    Joined
    Jul 2008
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    integer exponents

    Compute with the aid of a calculator. Write your answers in standard form.
    (-------- = divide by)

    48. a. (8.4*10^-22)(1.6*10^15)
    ---------------------------
    3.2*10^-11

    b. (9.4*10^24)(7.2*10^-18)
    -----------------------
    (4.5*10^26)(6.4*10^-16)

    i don't know how to solve this.
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  2. #2
    Super Member

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    Lexington, MA (USA)
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    Hello, comet2000!

    Compute with the aid of a calculator.
    Write your answers in standard form.

    48\,(a)\;\;\frac{(8.4 \times 10^{-22})(1.6 \times 10^{15})}{3.2 \times 10^{-11}}

    We have: . \frac{(8.4)(1.6)}{3.2} \times  \frac{(10^{-22})(10^{15})}{10^{-11}} \;=\;4.2 \times 10^4



    (b) \;\;\frac{(9.4 \times 10^{24})(7.2 \times 10^{-18})}{(4.5 \times 10^{26})(6.4 \times 10^{-16})}

    We have: . \frac{(9.4)(7.2)}{(4.5)(6.4)} \times \frac{(10^{24})(10^{-18})}{(10^{26})(10^{-16})} \;=\;2.35 \times 10^{-4}

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