First off, I'm kind of out of my element when it comes to formulas and figuring out how to come up with a formula for what I need. If you need any other information, let me know and I'll add it.
Scenario:
I need to determine the opacity percentage of these elements that I'm plotting on a map. Now, my scale of 0-100 is really 0.05-0.85. It's relative to the number of days since an event has happened. Meaning, if an event happened 0 days ago, the opacity should be 0.05, and if an event happened 365 days ago, the opacity should be 0.85. How do I form a formula to get the values in between?