Answer
141.2
Work Step by Step
We first isolate the natural log function on one side of the equation. We then apply the exponential function to both sides of the equation to cancel out the natural log function. Doing this, we find:
$$ln(3x) =3.75 \\ 3x = e^{(3.75)} \\ 3x = 42.5 \\ x= 14.2$$