Population growth can be modeled using the formula p=cr^t where c is the initial population, r is the growth factor, and t is the time in years. if you start with 100 mice, what will their population be in 5 years if it doubles every year?
a.10,000
b.1,000
c.320
d.3,200

So we know that there are 100 mice and their population doubles every year over a span of 5 years. 
We can use the formula provided which is 
We know the initial population (100) the growth factor (double or 2x) and the time (5 years)
P=(100) (2×2×2×2×2)
P=(100)32
P=3,200
Hope that helped :)