Respuesta :

9514 1404 393

Answer:

  a(n) = 19 -6n

Step-by-step explanation:

The first term is 13, and the common difference is 7 -13 = -6. The general term can be written ...

  a(n) = a(1) +d(n -1)

  a(n) = 13 -6(n -1)

This can be simplified to ...

  a(n) = 19 -6n

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