Asked by jeff
The fifth term of an arithmetic sequence is equal to 6 and the sum of the first 12 terms is equal to 45. Find the first term and the common difference.
having trouble with this, can't figure out the steps?
having trouble with this, can't figure out the steps?
Answers
Answered by
Scott
f = first term , d = difference
f + 4d = 6 ... 12f + 48d = 72
12f + 66d = 45
18d = -27
f + 4d = 6 ... 12f + 48d = 72
12f + 66d = 45
18d = -27
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