6+(5+1)
(5+1)=6
6(6)
6x6= 36
35-15 is 20. and 43-26 is 17. These two are different because you are regrouping in the 2d problem, as in the first, you just subtract.
I think its D but im not sure
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hope this helped!! a brainliest would be appreciated ❤️
Length times width times height.
Hope this helps!