Problem

For each of these geometric sequences: i) State

u_1

and

r

. ii) Find the formula for the general term

u_n

. iii) Find the 9th term of the sequence. a. 3, 6, 12, 24, ... b. 2, 10, 50, ... c. 512, 256, 128, ... d. 1, 3, 9, 27, ... e. 12, 18, 27, ... f.

\frac{1}{16}, -\frac{1}{8}, \frac{1}{4}, -\frac{1}{2}, \dots