Natural Logs?

Question

I can't remember how to do the ln of a number, can someone please show ln(90/75), I know it has something to do with 'e' function.

Seems like your right, thought I had to use that 'e' function...

Answer 1

ln (90/75)
ln (6/5)
ln 6 - ln 5
1.791 - 1.609
0.182

OR

ln (6/5)
ln (1.2) = x
e^(x) = 1.2
x = ln (1.2)
x = 0.182

Answer 2

Are you asking to just put it into an exponential form?

First note that 90/75 = 6/5 so you really just have ln(6/5)

ln(6/5) = N, N is some irrational number. Then:

e^N = 6/5

Answer 3

The ln or natural log function is the inverse of the e or exponential function i.e.

If y = e^x then ln(y) = x

We need a calculator to gives us approximations to the log of most values as a previous contributor says

Answer 4

the ln(90/75) = what ever number the calculator spits back when u plug it in

Answer 5

ln(90/75)
= ln(90) - ln(75)
= ln(15*6) - ln(15*5)
= ln(15) + ln(6) - ln(15) - ln(5)
= ln(6) - ln(5)
= ln(6/5) = ln(1.2)
= 0.1823......[from calculator]

Answer 6

ln(90/75)=ln90-ln75=0.182