Activity 2. NOW IT’S YOUR TURN!
A. Given the first term and the common ratio, write the rule for each geometric sequence. Then give the
first 3 terms. The first one is done for you.
Given
1. 𝑎�1=11, 𝑟�=2
Rule
First three terms
𝑎�𝑛�=11(2)𝑛�−1
2. 𝑎�1=8, 𝑟�=10
3. 𝑎�1=−10, 𝑟�=2
4. 𝑎�1=5, 𝑟�=6
5. 𝑎�1=4, 𝑟�=5
6. 𝑎�1=0.5, 𝑟�=−4
7. 𝑎�1=−3, 𝑟�=−2
8. 𝑎�1=−48, 𝑟�= 12
9. 𝑎�1= 13 , 𝑟�=√3
10. 𝑎�1=3𝑏� , 𝑟�=9
11. 𝑎�1=4𝑥� , 𝑟�=−𝑧�
B. Given the first three terms, write the rule for each geometric sequence.
1. 11, 33, 99, …
2. 25, 5, 1, …
3. -15, 30, -60, …
4. 0.20, 1.4, 9.8, …
5. 𝑚�𝑛�, 𝑚�𝑛�2, 𝑚�𝑛�3, …
11, 22, 44