Question

Ayuda plis :( para hoy​

Answer 1

Respuesta:

a) n = 8

b) n = 4

Explicación paso a paso:

a)

usamos la formula

an = a1 + d(n - 1)

37 = 9 + 4(n - 1)

37 = 9 + 4n - 4

37 = 5 + 4n

32 = 4n

8 = n

b)

an = a1 - d(n - 1)

-19 = 2 - 7 ( n - 1)

-19 = 2 -7n + 7

-19 = 9 - 7n

-28 = -7n

4 = n