Exponential growth have the same second difference in each
terms, unlike a linear growth the first difference is the same. In this problem
the 2nd difference common to them is 5.
month #1
80
month # 2
80 + 20= 100
Month #3
100 25=125
month #4
125+30=155
month #5
155+35=185
month#6
185+40=225
month #7
225+45=315
month #78
315 + 50 =365
32^3/5 = 8
64^2/3 = 16
81^1/4 = 3
49^1/2 = 7
125^2/3 = 25
now just put them in order from the smallest value to the largest