4) A population of 100 birds triples every year. Circle the equation that models the scenario and the number of years it takes for the population to reach 656,000.
a) y = 100(3)*, 8 years
b) y = 100(4)*, 7 years
c) y = 3(100)*, 1 year
d) y = 100(1.3)*, 34 years