Update: It really does go without saying, the FX-CG50 is a beast of a calculator. But my trusty FX-991EX is still good for a lot of things. They are both good calculators. :
Having a problem with CASIO fx-CG50 where every time without fail, it gives me this prompt when attempting to graph anything containing a variable. : r/ calculators
Casio fx-CG50 PRIZM calculator review - The Gadgeteer
Casio fx-CG50 Full Review - Math Class Calculator
Back-to-School with the Casio PRIZM Graphing Calculator - Redhead Mom