[Copy of] Ratio format colon

This activity is an attempt to give teachers a chance to automatically check student work on written ratios using a colon. The colon format of a ratio is not something whose value can be checked and is also not recognized by the patterns feature of Desmos classroom. The Desmos calculator uses colons in the context of setting up conditional statements, so if we pass the student's answer into the calculator as part of a function definition with a restriction, then do a little funny business with integrals to find the discontinuity, then we can figure out if the ratio is a match. I know this is a little elaborate for what it accomplishes, but so far it is the best solution I have come up with.

By Guzman Tierno