Thread: exponential equation

1. exponential equation

I need an answer very soon...

(36^x)-(39*6^x)=-350

2. Let $y=6^x$ then $36^x = y^2$ substitute that und solve.

3. I still can't get it to work, what would be the answer?

4. Think "Quadratic Formula".

5. 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.

6. Originally Posted by ryandman89
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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-Dan