Answer:
B & D
Step-by-step explanation:
If you do 30x10 it would equal 300
So that wouldn't be it. If you do 49x100 that will equal 4,900 which is correct. If you do 40x600 that would equal 24,000 which is also incorrect. The last one is correct because 400x80 is 32,000
(Your welcome!)
