3.A) His method works but he never zero paired to make it -6.
B) Yes he could since the answer would end up -6.
6.A) (+3)x(+7)=+21
B) (+4)x(-4)=-16
10. A) (+7)x(+2)=+14
B) (+6)x(-1)=-6
17. (+2)x(+8)=+16 so 16m is the answer.
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