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Posted by **Hannah** on Thursday, November 4, 2010 at 3:05pm.

so 7e^(-0.4 x 9) = .191

To get this answer I used a TI-83 calculator. My question is how do I enter this in a TI-30 calculator.? In my math class we are not allowed to use the TI-83.

- math -
**Reiny**, Thursday, November 4, 2010 at 4:36pmI know for the simplest TI-30, they have an INV button and for later models they have a 2ND function button, but here is my suggestion

.4

±

x

9

=

INV or 2ND

ln

=

x

7

you should get .191266..

- math -
**Hannah**, Thursday, November 4, 2010 at 4:51pmThank You!

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