1.) what is the sum of the geometric sequence where the first term the last term is 9, 375 and the common ratio is 5?

a. 11,718
b. 11,817
c. 17,181
d. 18,171

2.) what is the 7th term of a geometric sequence whose third term is 27 and whose common ratio is 3?

a. 2,379
b. 3,279
c. 7,329
d. 9,237

3.) what is the 6th term of the geometric sequence 2/25, 2/5, 2, 10, ...?

a. 25
b. 50
c. 250
d. 1500

4.) if three geometric means are interested between 1 and 256, what is the second geometric mean?

a. 64
b. 32
c. 4
d. 16​