Answer:
D . 9 .1/13
Step-by-step explanation:

x=3 and y=2 because 6+6 = 12 and 2 times 3 is 6 :)
12(2a-b) would be your answer :)
.28 if 1 was 100,and .28 was 2.8, then we divide 100 by 100 same for 2.8
4/9 (4 out of 9) because you add them all together then count the number of blue marbles then since you put back the first marble, the dominator is still the same