Step-by-step explanation:
By elimination method,
x+y=15
-x+y=5
------------
2y=20
i.e y=10
Now,
or, x+10=15
or, x=5
Answer:
9660 divided by 0.5 = 19,320
d.
1,580.6 ft2 is the answer
21 if adding but if multiplying 343
i hope i'm right and hoped i helped