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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fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right