18 that question is confusing so I guessed sorry dude
D is the answer. Hope this helped.
Answer:
Step-by-step explanation:

b.
an=an-1+3
C.
when x=15
y=3×15-2=45-2=43
a15=43
Answer:
B
Step-by-step explanation:
because it says between 4 and 8 and doesn't have a negative so its positive