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What is the common difference in the sequence 9, 4, -1, -6? A. 5 B. -5 C. 9 D. -11 (Am I dividing or subtracting?)
asked
Feb 27, 2018
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What is the common difference in the sequence 9, 4, -1, -6?
A. 5
B. -5
C. 9
D. -11
(Am I dividing or subtracting?)
Mathematics
high-school
FrankIJ
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FrankIJ
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Use first differences. You are subtracting. Difference = Subtracting.
9 - x = 4
4 - x = -1
-1 - x = -6
Find for x.
9 - x = 4
- x = 5
x = -5
Therefore the answer is B.
Proof:
9 - 5 = 4
4 - 5 = -1
-1 - 5 = -6
Pol
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Mar 6, 2018
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Pol
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