Answer:
3. all of the above
4. d=m/v
5. gas has well separated particles with no particular arrangement
liquid has particles close together but still with no particular arrangement
and solid has particles that are tightly packed, usually in a regular pattern
6. (idk what number it is but)
the density of the rock is 2.4 g/ml
d=m/v so d=12/v according to the question the mass is 12
to find volume subtract 20-15 because before the rock was 15 and after the rock was 20, so then you get 5 for volume
d=12/5 and when you calculate that, you would get 2.4g/ml ; hope this helped :-)