Respuesta :

15 - 1.5 = 13.5
13.5 - 1.5 = 12
12 - 1.5 = 10.5
10.5 - 1.5 = 9

10.5 is your fourth term 

hope this helps

Answer:

C) 15, 16.5, 18, 19.5

Step-by-step explanation:

15+1.5=16.5

16.5+1.5=18

18+1.5=19.5