Respuesta :

sqdancefan

Answer:

  an = -18 +11(n -1)

Step-by-step explanation:

We notice that the first term (a1) is -18, and the common difference (d) is -7-(-18) = 11. Filling these values into the form for the explicit formula gives ...

  an = a1 +d(n -1)

  an = -18 +11(n -1)