4. Which term of the arithmetic sequence 7, 1, -5, -11 . . . is -47?
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4. Which term of the arithmetic sequence 7, 1, -5, -11 . . . is -47?
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Answer:
10th term
Explanation:
an=A1+(n-1)d
-47= 7+(n-1)-6
-47= 7+-6n+6
-47-7-6=-6n
-60=-6n
n=10