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6 .   The   temperature   at   2   p . m .   22 ° C   above   zero .   If   it   decreases   at   the   rate   of   3 °   C   per   hour   until   mid - night ,   at   what   time   would   the   temperature   be   2 °   C   below   zero   ? 7 .   Write   any   three   pairs   if   integers   ( a ,   b )   such   that   a ÷ b = - 2

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