Asequence is defined recursively using the formula f(n + 1) = f(n) – 5 . which sequence could be generated using this formula?

1, –5, 25, –125,
2, 10, 50, 250,
3, –2, –7, –12,
4, 9, 14, 19,

Lets take second number in each sequance as
f(n+1) and first as
 f(n)

for first sequance we get:
25 = -5 -5 which is not true.

second sequance:
50 = 10 -5  again not true.

third sequance
-7 = -2 - 5 which is true. If we use f(n+1) to be -12 and f(n) to be -7 again we will see that formula describes this third sequance.

last one if we check for just in case we will see that it doesn't fallow the formula.