Answer:
a=4
Step-by-step explanation:
D because if it says -3 that means the opposite so go right because it is also horizontal and + means up so go up because it is vertical.
Alvin's age + Elga's age = 84
2R + R = 84
3 R = 84
3/ 3 R = 84/ 3
R = 28
Elga's age is 28
I believe the answer is 0
