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Mathematics 8 Online
OpenStudy (rayep12):

7−(−19)−18+(−19)+18

OpenStudy (abbles):

7 will be the answer. The -18 and +18 cancel out (18 - 18 = 0). Same with the -19 and the +19 (you get +19 from the two negatives). That leaves you with 7. Do you understand?

OpenStudy (lord_box):

Well, you had a 7, then did 2 things to it, then undid 2 things to it, so... you still have 7.

OpenStudy (rayep12):

yea

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