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Anonymous
If it has rechargable batteries, open the back, take out the batteries and put them in a charger. When recharged, put back in the calculator.
If it doesn't have rechargable batteries, just buy more batteries.
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Press 2ND MATRIX (above x-1). Select EDIT at the top with the arrow keys. The select matrix [B] and press ENTER. You can now edit the matrix. (Use the numbers at the upper right to set the size.)