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Math Help - exponential equation

  1. #1
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    exponential equation

    I need an answer very soon...

    (36^x)-(39*6^x)=-350
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  2. #2
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    Let y=6^x then 36^x = y^2 substitute that und solve.
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  3. #3
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    I still can't get it to work, what would be the answer?
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  4. #4
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    Think "Quadratic Formula".
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  5. #5
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    alright, thanks....what about this one...

    The following table shows the results of Jennifer's science experiment. x represents the number of hours into the experiment and y represents the average amount of algae present in a sample taken from her fish tank (in number of cells per slide).

    x 0 28 45 73 100 115 131 151
    y 4.67 5.33 6 6.33 10 10 10.33 12.33

    Use the Modeling Applet to find the best exponential model representing the amount of algae in the fish tank over time. (The coefficient and base should be rounded to 5 decimal places.) Use this model to predict the average amount of algae present in a sample after 137 hours. (Round your answer to 2 decimal places.)

    Its either a ln function or a power function but I can't figure out which one or how to find the formula.
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  6. #6
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    Quote Originally Posted by ryandman89 View Post
    alright, thanks....what about this one...

    The following table shows the results of Jennifer's science experiment. x represents the number of hours into the experiment and y represents the average amount of algae present in a sample taken from her fish tank (in number of cells per slide).

    x 0 28 45 73 100 115 131 151
    y 4.67 5.33 6 6.33 10 10 10.33 12.33

    Use the Modeling Applet to find the best exponential model representing the amount of algae in the fish tank over time. (The coefficient and base should be rounded to 5 decimal places.) Use this model to predict the average amount of algae present in a sample after 137 hours. (Round your answer to 2 decimal places.)

    Its either a ln function or a power function but I can't figure out which one or how to find the formula.
    Please post new questions in new threads.

    -Dan
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