Help me solve this log problem?

Posted by admin
Lady Janella asked:


I know that the answer is 29.3, but I have no idea how to get to it.

1.3=6.7e^(-48.1/x)

is there a way i can use the graph function on the calculator to do this? I need to know how to do these types of problems showing my work also. i just can’t seem to get past this:

-5.4=e^(-48.1/X)

and I don’t even think that is right. I subtracted the 6.7 from both sides. I left the “e” which is natural log, but I don’t know if I can leave the “e” by itself and I have NO IDEA what to do with that exponent. Can someone show me the steps?

BTW, I’m not looking for you to to my homework, I’m not at all lazy. This is just something I don’t understand.
thank you very much norman!

Francis

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    One Response to “Help me solve this log problem?”

    1. norman Says:
      July 23rd, 2007 at 10:41 am

      Its divide not subtract

      1.3/6.7 = e^(-48.1/x)
      ln(1.3/6.7) = -48.1/x
      x = -48.1 / ln(1.3/6.7)
      now use your calc to find the ans.