How do I build a report to show case volume?

How do I build a report to show case volume?

Evening!

I'm trying to build (what I thought was) a simple report, with line graph, that shows an aged account of how many cases are currently open/investigating in the system. Our current reporting allows us to spit out a report that shows the amount of open cases in the system, point in time on a Friday, and the previous X number of fridays.

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