Show that the equation above is homogeneous

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

Acoil formed by wrapping 80 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 28.0° with the direction of the field. when the magnetic field is increased uniformly from 200 µt to 600 µt in 0.400 as, an emf of magnitude 80.0 mv is induced in the coil. what is the total length of the wire?

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?