If you're asking for the model for the second problem (I didn't see any unsolved), here it is!
Answer:
the picture is blurry sorry can't help cause I can't see the question
So the equation you're going to be using is mass = density x volume
So the volume of your block is 35cm^3, and your density is .85g/ml
so your equation would be
mass=.85g/ml x 35cm^3
your final answer is 29.75g/cm^3
Hope this helps :)
