>>12179007Notation is ass.
ln(25)*e^(-t)=3
ln(25*e)^(-t)=3
I'll assume the first one?
You find it by isolating it in the equation by applying the same operations to both sides of the equation, until you have the t value isolated on one side of the equation, and your answer on the other side.
I have told you a general map for solving this.
Now just do your homework, and apply this method.
