what is the ninth term of the arithmetic sequence defined by the rule A(n)= -14+(n-1)(2)

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adamskibrianna adamskibrianna

03-01-2017
Mathematics

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what is the ninth term of the arithmetic sequence defined by the rule A(n)= -14+(n-1)(2)

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xEngineerOrg xEngineerOrg · Answer 1 · 2017-01-03T17:06:42+01:00

xEngineerOrg xEngineerOrg

03-01-2017

If you start counting from 0, you ninth term will be 8. Replace n=8 and calculate:
A(8) = -14 + (8-1)(2) = -14 + (7)(2) = -14 + 14 = 0

If you start counting from 1, your ninth term will be 9. Replace n=9 and calculate:
A(9) = -14 + (9-1)(2) = -14 + (8)(2) = -14 + 16 = 2

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