This looks great but it would be wonderful if you did two small tweaks. The first is to mention that you are always multiplying by One....the identity. The second is to not "let the 1 in the denominator "be understood". Visually it helps to see stacks all the way across. Overall Exceptional! For the Record I am a DODO and so have been looking for strong creative female voices in STAM...Science Technology Arts and Music. Right now its you and Kesha!