Graphing calculator problem?

my friend took my calculator and made it so that the top half of the eyeshade was a graph and the bottom partly was the usual screen where on earth i can do calculations, and i dont know how to fine-tuning it back so that hte full eyeshade is the normal eyeshade for where i can do calculation. i have a TI-83.

gratefulness


Answers:    I don't know how to do how to do it but there is master reset somewhere.

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