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

User Jmasterx
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a_1=-5;\ a_(12)=17\\\\a_(12)-a_1=11d\\\\11d=17-(-5)\\\\11d=17+5\\\\11d=22\ \ \ |:11\\\\d=2

Answer: The common difference is equal 2.

User GReX
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