Two airplanes left the same airport and arrived at the same destination at the same time. The first airplane left at 8:00 a.m. a
1 answer:
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Answer:
Step-by-step explanation:
If the series has a fixed gap between entities (terms).
Add the first and the last values and multiplied by the half of number of terms
For example
2,4,6,8,10 = 5/2 (2 + 10) =30
2+4+6+8+10 =30
