Deadly math problem, post 1

for my AP BC Calc class i'm working on a massive, 5-part word problem. i will be documenting my process here. note: I am already partly through the problem

7:27 PM: almost had variable storage crisis on my calculator. resulted in a renaming of variable R to S. i was able to save it by dividing Q by 8 again, as Q was unaffected in the accidental overwrite of R. disaster has been averted.