Answer:
D
Step-by-step explanation:
Common ratio of half means that to get each successive terms, you have to multiply the preceding term by half.
Since first term is 10
2nd term is 
3rd term is 
4th term is 
5th term is 
Answer choice D is right.
No because if you plug in 4 for x and 5 for y you get -4 not 36
51 snack in all because 18 + 23 = 51