# How do you solve e^(-5n-1)+3.9=75?

Aug 27, 2016

${e}^{- 5 n - 1} = 75 - 3.9$

${e}^{- 5 n - 1} = 71.1$

$- 5 n - 1 = \ln 71.1$

$- 5 n = \ln 71.1 + 1$

$n = - 1.05$

Hopefully this helps!