Question

Find the 5th term of the sequence which has a first term of 17 and has a common ratio of 3.1.

Answer 1

our n will be 5-1 =4

and with the first term of 17 with the common ration of 3.1 our 5th sequence term will be 
17(3.1^4) = 1570

Answer 2

The 1st term of the sequence:
a 1 = 17
r = 3.1
a n = a 1 * r^(n-1)
a 5 = a 1 * r^4
a 5 = 17 * 3.1^(4) = 17 * 92.3521
Answer:
a 5 = 1,569.9857