MATH PLEASE HELP!

According to Boyle's law, the pressure p of a compressed gas is inversely proportional to the volume, v. If a pressure of 20 pounds per square inch exists when the volume of the gas is 500 cubic inches, what is the pressure when the gas is compressed to 400 cubic inches?

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  1. P = k/V
    when P=20, V=500, so
    20 = k/500
    k = 10000
    then P = 10000/V

    if V - 400,
    P = 10000/400 = 25

    don't forget the units

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  2. PROOF: 2/LOG A BASE 9 - 1/ LOG A BASE 5 = 3/ LOG A BASE 3

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  3. thanks but how did you get 1000 by dividing k by 500?

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  4. I had 20 = k/500
    now multiply both sides by 500
    20(500) = (k/500)(500

    10000=k

    the 500's canceled on the right side

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  5. thank you so much! i really appreciate it!

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