Edward A. answered 04/24/19
Math Tutor, Retired Computer Scientist and Technical Communicator
Trevor, what is the goal of the function you want? The function you have written produces volume rather than area, so it’s not obvious to me that there’s anything wrong with it.
So, are you wanting a function that gives area? Or volume?
what is the meaning of “excess thickness”?
Larry C.Your equation has unbalanced parenthesis so should it be ((l*w)*(Excess thickness))/144 or l*w*((Excessive thickness)/144)?