Question

express these sum using sigma notation

3-5+7-9+11-13+15​

Answer 1

Step-by-step explanation:

plants, algae and cyanobacteria, long-term energy storage in the form of sugars is produced by a subsequent sequence of light-independent reactions called the Calvin cycle; some bacteria use different mechanisms, such as the reverse Krebs cycle, to achieve the same end. In the Calvin cycle, atmospheric carbon dioxide is incorporated into already existing organic carbon compounds, such as ribulose bisphosphate (RuBP).[5] Using the ATP and NADPH produced by the light-dependent reactions, the resulting compounds are then reduced and removed to form further carbohydrates, such as glucose.

Answer 2

Step-by-step explanation:

We can square n each time and sum the result:

Σ i=3. ii + 1 = 34 + 45 + 56.

Σ i=1. i(i+1) = 1×2 + 2×3 + 3×4 = 20. ...

Σ n=1. (2n+1) = 3 + 5 + 7 + 9 = 24. And we can use other letters, here we use i and sum up i × (i+1), going from 1 to 3:

Σ n=1. n2 = 12 + 22 + 32 + 42 = 30. We can add up the first four terms in the sequence 2n+1:

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