Answer:
The answers are A, C, and F
Explanation:
For A, 20 x 10 x 7 is 1400, then we do [2 x (20 x 4 x 4)]
20 x 4 x 4 is 320 then multiply by 2, and it is 640. 1400 + 640 is 2040.
For C, we already have 1400, now we do (20 x 4 x 4) + (20 x 4 x 4)
(20 x 4 x 4 = 320) and (20 x 4 x 4 = 320) so we both of them and we get 640. we add our 1400 with 640 and get 2040 again.
And For F, (200 x 7) is the same as (20 x 10 x 7) which is 1400, 80 x 4 is just like (20 x 4 x 4) which is 320. We multiply it with the 2 and get 640.
We add 1400 and 640 and get 2040 again.
Hope this helps <:)