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OpenStudy (anonymous):
does 10 +9 = 21
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Nnesha (nnesha):
what is 10 + 9
OpenStudy (anonymous):
no
OpenStudy (anonymous):
19
OpenStudy (anonymous):
thank u
OpenStudy (k_lynn):
no it does not equal 21. Adding 10 and 9 is like adding 10+10. ten plus ten equals 20 but we were adding 10 plus 9. so subtract one from 20 and you get 19. THerefore, 10+9=19 |dw:1412700309608:dw|
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