Answer:
0; 3; 9.
Step-by-step explanation:
If x=20 then y=0.5x20-10 so: 20x0.5=10 10-10=0
If x=26 then y=0.5x26-10 so: 26x0.5=13 13-10=3
If x=38 then y=0.5x38-10 so: 38x0.5=19 19-10=9
