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Help please and explanation please

Help please and explanation please-example-1
User Abenson
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1 Answer

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For this case we must add the given series. We expanded the series for each of the values of i, that is, from 1 to 5:
3 (1) +3 (2) +3 (3) +3 (4) +3 (5) =\\3 + 6 + 9 + 12 + 15 =

We add the terms:


9 + 9 + 12 + 15 =\\18 + 12 + 15 =\\30 + 15 =\\45

Finally, the value of the given series is 45.

Answer:

45

User Richardissimo
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