Answer:
0u
7u
6u
2u
Step-by-step explanation:
All of these question are just a matter of adding like terms
For the first one we have
7u+(-u)+(-6u)
which is equal to 
7u-u-6u
Which I'm sure you can see is equal to 0 or 0u
10/2u+2u
10/2u=5u
5u+2u=7u 
6u+0u
0u=0
6u
6u+(-4u)
6u-4u
2u
 
        
                    
             
        
        
        
if each block is 2/3 miles long, and he walks 4 1/2 blocks, we can simply multiply to two. It looks like this:
(2/3)(4 1/2)
to multiply, make 4 1/2 into an improper fraction and multiply normally
(2/3)(9/4)
Ton walks 3 miles total.
 
        
             
        
        
        
40/40
8x5=40
10x4=40
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Hello, hope this makes some sense, the midpoint formula is what’s given in the picture and the rest is just substitution
 
        
        
        
Try to count your square and use the formula lxwxh