There are no answer options so I will just simplify the expression:
3xy-(2x+4xy)
3xy-2x-4xy
-2x-xy
Yes, there is enough space . If the guinea pigs need 12 feet, and 5*3= 15 feet then they have enough.
( idk if means 12 feet of living space for each or all 3 , but here i hope it helps :) )