Ascientist is observing the grizzly bear population in two state parks. the parks each have 150 bears when he begins observing them. the population in park a increases by 20% each year. the population in park b decreases by 20% each year. in each equation, y represents the bear population with respect to a number of years, x. drag each equation to show whether it can be used to represent the bear population in park a, park b, or neither of these.