This is all very simple math, divide the figures into 2 or more separate blocks. Next adjust the measurements, then calculate the volume of both boxes (LxWxH) and add them together to get the answer.
I can answer only from 1 to 4 since idk how to do number 5 and the picture is missing part of number 6. 1) would be 12 since the bottom block would be 4*2*1 (8) and then 2*2*1 would be 4. 4+8= 12 cubic inch.
2) You did it correctly!
3) 6*3*1=18 and 7*1*3=21 21+18 is 39 cubic inch.
4) 6*4*12= 288 and 8*4*4= 128 128+288= 416 cubic ft I am like 98% I did it correctly but sometimes I have a mistake so... yeah hope it helps!
