Find a1 in the arithmetic series with s7=287 and d=12

Wyatt Weeks 2022-10-24 Answered
Find a1 in the arithmetic series with s7=287 and d=12
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Answers (1)

Sauppypefpg
Answered 2022-10-25 Author has 23 answers
For an arithmetic series with initial term a 1 and difference between terms of d
XXX a n = a 1 + ( n - 1 ) d

We are told d = 12
and a 7 = 287

So
XXX a 7 = 287 = a 1 + ( 7 - 1 ) × 12 = a 1 + 72

XXX a 1 = 287 - 72 = 215
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