C
because in X, the difference from 4 to 6 is 2, the difference from 6 to 10 is 4, the difference from 10 to 12 is 2
so n = 3
in Y, 1 to 9 is 8, 21 to 25 is 4.
9 + 6 is 15
(23*2)-12=x x=34
step-by-step explanation:
answer: 12,000
step-by-step explanation: first you ar e supposed to add. then multiply then subtract