Answer:
24+2x+2y
or
B) 122 units² if the missing measurement is 7.
Explanation:
12+12+x+x+y+y=24+2x+2y
The surface area cannot be determined with just a number and no variables because there is a missing measurement.
The missing measurement looks a lot like 7 so let's assume it's 7
12+12+21+21+28+28=122 units²