What does e equal?
Always remember the simple rule of P.E.M.D.A.S. Known as the order of operations.
If you use this method start from the left to the right...
Parenthesis | Exponents | Multiplication | Division | Addition | Subtraction
An easy way to remember it is "(P)lease (e)xcuse (m)y (d)ear (a)unt (s)ally."
Hope this helps!