The mean temperature for the first 4 days in january was -4°c. the mean temperature for the first 5 days in january was -6°c. what was the temperature on the 5th day?

it is definatly the 3rd one. very much looks like it, for a good chance, the third one would be best for you.

8(4)^8=72^feet to say that the total can conclude to 8(4) which as you know would mean 8 x 4. that equals 32w. 32^ could make a 72 answer as well. but your coefficent will remain w so your answer is 72w.

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i'm guessing it might be 40.