1. One scientist is measuring a physical quantity on a strange unit. For example, the time taken by the light to travel from a star to the earth was measured in units "BRT". If this unit has to make sense, what has to be defined? Justify your answer.
2. The circumference (c) and diameter (d) of a circle are related as, c = d. How would you express this equation in the form of y =mx + b? Explain.