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Mathematics 8 Online
OpenStudy (anonymous):

The first term of an arithmetic sequence is -5, and the twelfth term is 17. Find the common difference.

OpenStudy (lgbasallote):

the formula is \[a_n = a_1 + (n-1)d\] the first term is -5 so that\s a1 twelfth term is 17 so that's an since 17 is the TWELFTH term that means there are TWELVE terms so n = 12 can you solve d now?

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