Answer:

Explanation:
The specific heats of water and steel are


Assuming that the water and steel are into an <em>adiabatic calorimeter</em> (there's no heat transferred to the enviroment), the temperature of both is identical when the system gets to the equilibrium
An energy balance can be written as
Replacing

Then, the temperature 
Answer:
letter C I'm not sure to my answer but hope it can hrlp
Answer:
The blue line has the greatest desnsity
Explanation:becuase it has higher mass than any of the other ones