Density = mass/volume
We know the density is 1.30 g/cm3.
We know the mass is 8.60 kg.
So, we can easily calculate the volume, but first we need to get our units to be the same and consistent.
Let us change the mass from kg to g. 8.60 kg x 1000 g/kg = 8600 g
From density = mass/volume we can solve for volume...
volume = mass/density = 8600g/1.30 g/cm3
volume = 6615.4 cm3 = 6620 cm3 (3 significant figures)