Find the first term of the arithmetic sequence having the data given S_n=781, d = 3, n = 22

rustenig

rustenig

Answered question

2022-09-10

Find the first term of the arithmetic sequence having the data given S n = 781 , d = 3, n = 22

Answer & Explanation

SlowlFeet45

SlowlFeet45

Beginner2022-09-11Added 11 answers

a is the first term.
781 = 22 2 ( 2 a + ( 22 - 1 ) 3 )
781 = 11 ( 2 a + 63 )
781 = 22 a + 693
88 = 22 a
4 = a
Practice exercises:
An arithetic sequence of 14 terms has a sum of -322. The first term is -2. Find the common ratio, r.

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