As a town gets smaller, the population of its high school decreases by 4% each year. The senior class has 160 students now. In how many years will it have about 100 students? Write an equation. Then solve the equation without graphing. (please help I've been stuck for to long )

a) Write an equation to represent this situation. Let n be the number of years before the class will have 100 students.

b) In n ___ enter your response here years the senior class will have about 100 students.