which of the following illustrates an arithmetic sequence
A. -27, 81, -243
B. 27, -81, 243
C. 18, 21, 24
D. 18, -21, 24
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A. -27, 81, -243
B. 27, -81, 243
C. 18, 21, 24
D. 18, -21, 24
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Answer:
C.
Step-by-step explanation:
The difference between 18 and 21 is 3.
Add them: 3+21= 24
Note:
Find their difference then add it to the last number.
24+3= 27
27+3= 30
30+3= 33
common difference is 3.