Variables in Context Practice Test

In a chemistry experiment, the temperature $$T$$ (in degrees Celsius) of a solution after $$m$$ minutes is given by $$T = 25 + 3m$$. What does the coefficient 3 represent in this context?

A company's profit $$P$$ (in thousands of dollars) is related to the number of units sold $$n$$ by the equation $$P = 12n - 200$$. What does it mean when $$P = 0$$ in this business context?