The GCF is 5m2
5 is a prime number common to both terms.
The GCF is 15m3
If you are given the volume [V] and density [p], the object`s mass [m] is given by the relation: m = p*V , where (*) indicates multiplication. Also, make sure that all units are in the same measurement system (Metric, Imperial, etc.) As an example, lets say I have a tank of water (p=1000 kg per m3 for water) that is 15m3 in volume. The mass of water in the tank is: m = (1000)*(15) kg = 15, 000 kg