Asked by math
For an arithmetic sequence. Given: S5 + S6 = 44 and S11 = 47, find S22.
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Answered by
oobleck
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a+4d + a+5d = 44
11/2 (2a + 10d) = 47
to find a and d, then find S22 = 22/2 (2a+21d)
a+4d + a+5d = 44
11/2 (2a + 10d) = 47
to find a and d, then find S22 = 22/2 (2a+21d)
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