Given that $\sum_{i=1}^{10} 2d_i = -8$, and $\sum_{i=6}^{10} 3d_i = 6$, what is $\sum_{i=1}^{5} d_i$?
Added by Tara S.
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From 2d; - 8, we can isolate d; by adding 8 to both sides: 2d; - 8 + 8 = 0 + 8 2d; = 8 d; = 4 From 3d; = 6, we can isolate d; by dividing both sides by 3: Show more…
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