please help me on number 6 only tell me the Mass of it and how

Answer: Hi! to find the density of this object you have to calculate the volume first.
V= l x w x h
the volume of this is 40
now that we have the volume we can calculate the density by using a formula
P= m/v
= 300(mass) / 40(volume)
= 7.5 (don’t forget to add units if nessceary)
Explanation: hope this helps! :)