A.Identify the common ratio and the next term of the following sequence.
1. 1, 2, 4, 8, ...
2. 80, 20, 8, ..
3. 2, -8, 32, -128, ...
4. Find the 10th term of the geometric sequence 8, 4, 2, 1, ...?
need answer po
1. 1, 2, 4, 8, ...
2. 80, 20, 8, ..
3. 2, -8, 32, -128, ...
4. Find the 10th term of the geometric sequence 8, 4, 2, 1, ...?
need answer po
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Answer:
1. r = 2
2. r = 4
3. r = 4 or r = -4
4. -64
Solution
formula an = arn-¹
a10 =(8)(2)¹⁰-¹
a10 = (8)(2)⁹
a10 = (8)(1,024)
a10 = 8,192