The köppen classification system is used as a classification system for

The Koppen Classification System is used as a classification system for climate based on native vegetation. We can look into countries different vegetation levels based on the type of climate which is common in their own country. The Koppen Classification System is one of the most widely used classification systems in the world and is seen as one of the best.

5×^2+20-15 or -(5x^2-20+15)

Ibelieve it was because of the gas act in order to preserve fuel