B. four times the value of y = the value of y+9
List the GCF of 18 and 28
18: 1, 2, 3, 6, 9, 18
28: 1, 2, 4, 7, 14, 28
So 2 is the GCF because it is the greatest number that can divide by both numbers
0.25 is 1/4 if that's what youre asking, i'm not sure,
