23. The answer is B) x-6.
23.) The answer is D) x + 3
A formula is recursive if it expresses the term
in terms of the previous one(s) 
In this case, every term is 7 more than the previous one, so the formula for
will only involve
:

In fact, this formula is simply saying: for every index
, the term with that index is 7 more than the term before.
Also, we have to specify the starting point (otherwise we would go backwards indefinitely), so the complete recursive formula is

which means: start with 2 and generate every other term by adding 7 to the previous one.
Sorry I dont no hala da yazıyor ben ne oldu sana böyle
Could you get a closer picture?
Fourty million, twenty-three thousand, thirty-two.
40,000,000 + 20,000 + 3,000 + 30 + 2