Final answer:
The correct formula for calculating the mass of a substance is m = pV and the formula for calculating the volume of a substance is V = m/p.
Step-by-step explanation:
The correct answer is:
a) Mass = rhoV, Volume = m/rho
The formula for calculating the mass of a substance is mass = density x volume (m = pV). The formula for calculating the volume of a substance is volume = mass/density (V = m/p).