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MARKAIANLERIOSIN
Answered

find the sum of the first 19 terms of the arithmetic sequence 9 14 19 24​

Sagot :

KEIA0KRAZYIN

Answer:

1,026

Step-by-step explanation:

An=A1+(n-1)d

An=9+(19-1) 5

An=9+(18)5

An=9+90

An=99

Sn=/2 (a1+an)

S19=19/2 (9+99)

S19=19/2 (108)

S19=1,026

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