Landon bought a tray of plants for $8.15. there were 16 plants in the tray. if landon only bought 1 plant, about how much would it have cost ?

Plz me i need i will give a brain

Just tell me how to set up the equation.

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?