Answer:
9x+7y
Step-by-step explanation:
please see the image that I have attached
A. 3
B. 3/4
C. 1/4
1/4 of 12 is 3
3 plus 6 is 9 and 9 is 3/4 of 12
12 minus nine is also three leaving the tank still a 1/4 tank empty
