Answer:
D
Explanation:
If the temperature decreases by 7 then increases by 7, then it is the same temperature. x-7+7=x
increase means + and decrease means -
A. +2 -6 = -4
B -5+1 = -4
C +6 -4 = 2
D -7+7 =0
We want to end up where we started which is a net gain of 0
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