Asked by fatusin lawrence

The sum of the first 21 terms of the progression, -18, -15, -12,...is?
Answered by oobleck
For any AP,
Sn = n/2 (2a + (n-1) d)
So plug in your numbers.
Answered by JENNY
-630
Answered by Zachariah
find the sum of the 21 term of the progression -18-15-12 ?
Answered by Abas
252 is the answer
Answered by Mohammed ibrahim
The sum of the first 21 term of the progrestion- 18-15,-12--- is
Answered by Valerie
I got 252 too I don't know if I am correct
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