HP17bII+ Programming t-distribution

[Don Shepherd]

Yes, if you omit the = the solver simply equates what you give it to 0 and solves for the unknown variable. So it should solve for t in my example, but it gives that error message.

I'm out of my league in this thread. I'm going to start a new thread with a 17b formula for calculating a standard mod-10 check digit, like they do on credit card numbers and other ID numbers. I wrote a solver equation for that years ago and recently improved on it.