Find s15 for the following sequence40,34, 28,22

- 30

Step-by-step explanation:

Note the common difference d between consecutive terms in the sequence

d = 34 - 40 = 28 - 34 = 22 - 22 = - 6

This indicates the sequence is arithmetic with sum to n terms calculated as

= [ 2a₁ + (n - 1)d ]

where a₁ is the first term and d the common difference

Here a₁ = 40 and d = - 6, thus

= [ (2 × 40) + (14 × - 6) ], that is

= 7.5(80 - 84) = 7.5 × - 4 = - 30

Step-by-step explanation:

Use the Arithmetic Sequence to figure this out.

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