Find the first term, the common difference, and give a recursive formula for the arithmetic sequence.7th term is 55; 15th term is 135

A. a1 = -15, d = 10, an = an-1 + 10
B. a1 = -5, d = 10, an = an-1 + 10
C. a1 = -5, d = 10, an = an-1 - 10
D. a1 = -15, d = 10, an = an-1 - 10


Answer: B

Mathematics

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