Final answer:
To solve p = m / V for m, multiply both sides by V to get m = pV, which represents mass being equal to density times volume.
Step-by-step explanation:
To solve the formula p = m / V, where p is the symbol for density, m is the mass, and V is the volume occupied by the substance, for m, you need to isolate m on one side of the equation. By multiplying both sides by V, the equation becomes m = pV. This shows that mass is equal to density times volume. The correct answer from the provided options is a) m = pV.