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Here's my solution. There were a few things I wasn't sure how to do; get the y axis label to show up in bold, display the x axis tick marks without showing year labels, or color the font in the legend. Maybe with the new interactive chart tool the output will just have to look a little different.
Managed to answer all advanced questions. Nice challenge!
who knew calculating a trend line would be so tricky. I gave up on the stretch goals 😞
Had a fun time with this one. I made a chart very similar to the example, but there's no point in showing that one. Here's one with trend lines.
Attached is my workflow. Created chart, then used linear regression to find trend lines for 2nd chart. Based intersection calculation on the linear regression results and calculating the intersection of the lines using the point slope method and cross solving (think quadratic formula type math).