Answers

2015-12-13T19:06:53+08:00
2(28) + 4
56 + 4 = 60

5(28) + (-80)
140 + (-80) = 60

Note: If an integer is negative, make sure that you put parenthesis on it, just to be careful. ☺
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2015-12-13T20:45:00+08:00