Answers

2016-07-20T19:08:11+08:00
Use the formula of getting the common difference of an arithmetic sequence, which is : a2 - a1

(k+2) - (5k-3) = (3k - 11) - (k + 2)
k + 2 - 5k + 3 = 3k - 11 - k - 2
-4k + 5 = 2k - 13
5 + 13 = 2k + 4k
18 = 6k
18/6 = 6k/6
3 = k
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