Answer:
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Step-by-step explanation:
Answer:
q=-5
Step-by-step explanation:
6+q=1
Isolate the variable by subtracting 6 from both sides of the equation
q=1-6
q=-5
The answer to that is 140
Assuming you mean the sequence is given explicitly by

, the sum of the first 15 terms is

Recall Faulhaber's formulas, which say


Our sum is then
The answer is the first answer