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July 24, 2014

July 24, 2014

Posted by **Hannah** on Thursday, March 8, 2012 at 10:11pm.

t = 126 s

First I did 4.86e-2 - 1.80e-2 and then on my calculator I pressed the 2nd button and then ln and got 1.031. Then I did the same thing to get the ln of 5.01e-3 and divided that by 1.031 but did not get 126 as the answer. Where did I mess up?

Math - Steve, Thursday, March 8, 2012 at 5:31pm

Does the equation mean

ln(.00501) = ln(.0486) - (.0180s - 1)(ts)?

Doesn't look like that's what you were doing. Try reposting with plenty of parentheses for clarity.

Use ^ for power if needed as in s^(-1) for 1/s

yes thats what it means and how I posted it is exactly how it is written on my homework but I just cant seem to get that answer

Am I suppose to convert seconds into something else??

- Math(Please help) -
**Steve**, Friday, March 9, 2012 at 12:34pmln .0051 = −5.2963

ln .0486 = −3.0241

so now we have

-2.2722 = .0180t(s-s^2)

t = 126.233/(s-s^2)

Now, if the problem read

ln [5.01E-3] = ln(4.86E-2) - (1.80E-2/s)(t)

it would be a better fit.

I think your s-1 was really s^(-1)

- Math(Please help) -
**Hannah**, Friday, March 9, 2012 at 6:18pmok thank you so much!!!

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