Posted by **Phoebe** on Monday, March 4, 2013 at 5:27pm.

The answer to this should be 201.7, but I keep getting off track.

300=70+(375-70) e^ -k*10

230=305 e^-10*k

ln 230=ln 305 e^-10*k

ln 230= ln 305 -10*k

- more of the same -
**Steve**, Monday, March 4, 2013 at 5:39pm
yes, you do get off track.

Line 3 should be

(because ln ab = ln a + ln b)

ln 230=ln 305 + ln( e^-10*k)

ln 230 - ln 305 = -10k

because ln(e^x) = x

now go from there.

In fact, I'd have divided first:

230=305 e^-10*k

230/305 = e^-10k

- more of the same -
**Steve**, Monday, March 4, 2013 at 5:42pm
201.7? I get nothing like that

.75 = e^-10k

-10k = -.287

k = .0287

There must be something wrong with the way you wrote the problem.

I mean e^(-10*201.7) = a very very very tiny number. Some missing parentheses?

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