Which expression has a value of 4?

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =

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?