Question 884757: Find the sum of the terms of the following arithmetic progressions.
-10, -7, -4,.. To 12 terms.
Please solve this!
Found 2 solutions by JulietG, MathTherapy:
Answer by JulietG(1812)   (Show Source):
You can put this solution on YOUR website! -10 +3 = -7
-7 + 3 = -4
-4 + 3 = -1
-1 + 3 = 2
2 + 3 = 5
5 + 3 = 8
8 + 3 = 11
11 + 3 = 14
14 + 3 = 17
17 + 3 = 20
20 + 3 = 23
23 + 3 = 26
.
Added together:
-7-4-1+2+5+8+11+14+17+20+23+26 = 114
Answer by MathTherapy(10552)  (Show Source):
You can put this solution on YOUR website!
Find the sum of the terms of the following arithmetic progressions.
-10, -7, -4,.. To 12 terms.
 , with:
 being the sum of the 12 arithmetic terms
n being the number of terms
 being the 1st term, or term 1
d being the common difference
Thus, becomes:
You can do the check!!
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