1. Find the approximate sum of the first 8 terms of the geometric series defined bya1=1.5;r=1.3

2. Given the following geometric series, find S12.

91+31+1+...

3. The first term of a geometric series is 2. The sum of the first two terms is 7, and the sum of the first three terms of the series is 19.5. What is the sum of the first 5 terms of this series?

4. The sum of the first three terms of a geometric series is 27.10, and the common ratio is 0.9. What is the first term of the

series?

5. The general term of a geometric sequence is tn=3(5)2n, wheren is a positive integer. Show all steps to find the sum of the first 6 terms of the sequence, rounded to the nearest hundredth if necessary if necessary.