Is the sequence 7, –1.4, 0.28, –0.056, … geometric? If so, identify the common ratio. Need help!?
1. Is the sequence 7, –1.4, 0.28, –0.056, … geometric? If so, identify the common ratio and find the next two terms.
A. yes; r = –0.02; 0.00112, –0.000224
B. yes; r = –0.2; 0.0112, –0.00224
C. yes; r = –0.2; 0.028, –0.0056
D. no
2. Identify the sequence 6, 18, 54, 162, … as arithmetic, geometric, or neither. Then find the next two terms.
A. geometric; 480, 1440
B. geometric; 486, 1458
C. arithmetic; 486, 1458
D. neither; 486, 1458
3. The sequence 3, 6, 9, 12 is geometric.
True or false?
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Answers & Comments
Verified answer
1.
B
2.
This one is geometric with r = 3, so
B
3.
False, 6 / 3 = 2
9 / 6 = 3 / 2
3 / 2 is not equal to 2
so it isn't geometric