Final answer:
To make z the subject of the equation z/r = nq, simply multiply both sides by r, which gives z = nrq.
Step-by-step explanation:
To rearrange the equation z/r = nq to make z the subject, you would multiply both sides of the equation by r. This clears the division by r on the left side and gives you z = nrq. The variable z is now the subject of the equation, which means that z is isolated on one side of the equation, with all other variables and constants on the other side.