Answer:
-30
Step-by-step explanation:
400-[200-{35+15-70(100/25)}]
400-[200-{35+15-70(4)}]
400-[200-{35+15-280}]
400-[200-{50-280}]
400-[200-{-230}]
400-[430]
4m+9
4(m+9)
4(m+9)=4m+9
it is B