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Here is Abby's question:

Differential Equations time constant problem? - Yahoo! Answers

I have posted a link there to this topic so the OP can find my response.

Here is a link to the original question:Differential Equations time constant problem? The time constant T is the amount of time that an exponentially decaying quantity takes to decay by a factor of 1/e. Given an exponentially decaying quantity r(t) with the initial value r0 = r(0), show that its time constant is the time at which the tangent line to the graph of r(t)/r0 at (0,1) crosses the t-axis.

Please help! I can't figure this out. Please explain your steps so I can understand for future questions. Thank you!

Differential Equations time constant problem? - Yahoo! Answers

I have posted a link there to this topic so the OP can find my response.

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