Asked by Adelakun
The 4th term of an arithmetic progression is 6.if the sum of the 8th and 9th terms is -72.what is the common difference
Answers
Answered by
R_scott
6 + 4d + 6 + 5d = -72
12 + 9d = -72 ... 9d = -84 ... d = -9 1/3
12 + 9d = -72 ... 9d = -84 ... d = -9 1/3
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