Posted by **Hannah** on Sunday, March 11, 2012 at 1:53pm.

ln [1.70E-2] = ln(0.144) - (k s-1)(3609 s)

Solve for k.

I have a TI30 calculator. Am I suppose to press just the ln button or do I have to press 2nd and then ln??

- Math - Suggestion -
**Steve**, Sunday, March 11, 2012 at 6:58pm
If you know what the formula is, but can't figure out which buttons to press, I suggest that you sit down with your calculator manual and spend a few days going through the examples they will surely have.

I remember when I got my first slide rule. *gasp* I spent two weeks just going through the manual. After that, I knew the machine inside and out.

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