Two separate questions:
1- I'm dividing two cells (C2/B2) and both cells are 0. I want the answer
(even if it is zero) in cell D2 and I'm getting #DIV/0 error message. How do
I get 0 in D2?

2-Created a spreadsheet that gets updated on a weekly basis, how do I
average 4 numbers that aren't consistent (Cells are B9, B20, B31, B42), but
want to keep a running average throughout the month at the bottom of the
spreadsheet and do not want to have #DIV/0 in the cells that are at the end
of the month (which means that the numbers haven't been entered yet).
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CAS