Answer:
a is the right answer atleast that's what I think
Simply add and multiply the numbers and you get 13.235
in word form that would be
13 and 2 tenths and 3 hundredths and 5 thousandths
20,146,974. 78,901,234. 46,123,086.
76,543,218. 54,876,547
X=11+1=12 hope I helped you