Question 376579
e^(-15x)= 1000
Like you said, find the ln of both sides, we know that the ln(e) = 1 so we have:
-15x = ln(1000)
-15x = 6.907755
x = {{{6.907755/(-15)}}}
x = -.4605
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Check this on your calc, enter e^(-15*-4605) = 999.745 ~ 1000