The sum of a geometric sequence is:
s(n)=a(1-r^n)/(1-r)
The sequence rule for a geometric sequence is:
a(n)=ar^(n-1)
Not sure what they mean by "graph the six terms"
The sum of the first six terms is in this case:
s(6)=5(1-1.25^6)/(1-1.25)
s(6)=56.2939453125
The first six terms in sequence is in this case:
a(n)=5(1.25)^(n-1) so
5, 6.25, 7.8125, 9.765625, 12.20703125, 15.2587890625
