Friday
August 1, 2014

Homework Help: Geometry

Posted by John on Friday, March 1, 2013 at 7:48pm.

Luis has a simple calculator that has buttons for the digits 0 through 9, each of the 4 basic operations (+, - ,*,/ ), and an '=' button. Luis pushes a digit followed by the '+' sign, followed by another digit, followed by the '-' sign, followed by another digit and then the '=' sign. How many different answers could Luis get? Need unique answers.

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