The density of an object is calculated with formula [[$ \rho = \displaystyle\frac {m} {V} $]], where [[$ ρ $]] is the density, [[$ m $]] is the mass and [[$ V $]] is the volume. How are the following proportional to each other?

a) [[$ m $]] and [[$ V $]], if [[$ ρ $]] is constant?

Answer: [[$ m $]] and [[$ V $]] are directly inversely proportional.

b) [[$ m $]] and [[$ ρ $]], if [[$ V $]] is constant?

Answer: [[$ m $]] and [[$ ρ $]] are directly inversely proportional.

c) [[$ ρ $]] and [[$ V $]], if [[$ m $]] is constant?

Answer: [[$ ρ $]] and [[$ V $]] are directly inversely proportional.