It’s D, when lines are perpendicular, the slopes of the lines are opposite reciprocals.
Answer:

Step-by-step explanation:

We have

Substitute:

each term is negative and 1/4 of previous term so the nth term is the n-1 term times -1/4 so f(n)= -1/4 f(n-1)
Answer:
1) A KitKat Crispy bar
2) B4
3) Then the machine is broken
4) It could be a malfunction
5) No, someone messed up the stickers
6) Them the machine is working