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Pre-Algebra 10 Online
OpenStudy (anonymous):

Patricia subtracted +15 - +6 and got the answer +21. What error did Patricia make?

OpenStudy (akashdeepdeb):

WELCOME TO OPENSTUDY!! :D

OpenStudy (uri):

- + =- So, 15-6=9

OpenStudy (akashdeepdeb):

Patricia ought to have known that - + + = - :D And that it should have been 9.

OpenStudy (anonymous):

its integers

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