Show youre work on all of them for 17 points 5 ,6,7,9

5. 5 1/8 - 4 1/5 
5 5/40 - 4 8/40
4 45/40 - 4 8/40 =
37/40.

6. 4 79/100 + 5 9/10
4 79/100 + 5 90/100
79 + 90 = 169.
9 169/100 or 10 69/100.

7. 13/16 + 2/3
39/48 + 32/48
71/48 or 1 23/48.

9. 7 8/9 + 9 7/8
7 64/72 + 9 63/72.
16 127/72 or 17 55/72

I think these are the answers.

2160ft^3 i think you could use a formala to you out with this in the future