SOLUTION: Make d the subject of the formula: S = n/2[2a+(n-1)d]

SOLUTION: Make d the subject of the formula: S = n/2[2a+(n-1)d]

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Question 903012: Make d the subject of the formula:
S = n/2[2a+(n-1)d]
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
S = n/2[2a+(n-1)d]
(2/n)S = [2a+(n-1)d]
2S/n = 2a + (n-1)d
2S/n - 2a = (n-1)d
= d
0r
= d

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