First question:
Density = [tex]\frac{mass}{volume}[/tex]
Mass = density × volume
The density of the cube is 1.2g/cm³
The volume of the cube is given by side × side × side:
Volume = 7cm × 7cm × 7cm = 347cm³
Mass = 1.2g/cm³ × 343cm³ = 411.6g
*Hint: Just apply the formula Density = [tex]\frac{mass}{volume}[/tex] to solve the next questions.
