How to Solve These Math Equations for x?

[Vi Nguyen]

Solve for x:

10^(x) = 105

e^(x) = 100

3^(2x) = 50

0.5*e^(-x) = 0.2

ln x^(2) = 6

5 ln 3x = 12

 

[Greg]

Let's start with the first one, $10^x=105$. Where are you having difficulty?