Is it possible to determine the exact final temperature if you mixed some 700C water with some 400C water? Why or Why not?

No, the 700C will be cooled by the 400C water while the 700C water also heats up the 400C water meaning that the temperature will be something between the two. There is no direct answer, only predictions

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which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?  

answer

a 75kg dining table