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In Math / Senior High School | 2024-09-05

The sum of the first n terms of an arithmetic sequence is 438 and the last term is 75. If the common difference is 7, find a1 and n. Maayos na sagot please, thank you. ☹️​

Asked by ashues

Answer (1)

Given: Sn = 438; an = 75; d = 7; a₁ = ?; n = ?Solution: *in the pic attached*Answer: The answers are a₁ = -2 and n = 12.

Answered by haymeist | 2024-09-05

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