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
 
        
                    
             
        
        
        
Answer:
27.49
Step-by-step explanation:
 
        
             
        
        
        
Answer:
7√(x) = 14
Step-by-step explanation:
 
        
             
        
        
        
Answer:
45 ° 
Step-by-step explanation:
 m< ABC = m< DBC + m< ABD 
 = 115 _ 70 
 = 45 ° 
 
        
             
        
        
        
so, 7 is neutral anything past 7 is considered basic. 
answer: <em>a water and ammonia solution with a pH of 11 (very basic).</em>
<em />any number under 7 is acidic and of course there are different degrees of acidic just like there are different degrees of basicity.   
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- stomach's digestive juices, would be considered very acidic
-apple juice is also acidic but not as acidic  like stomach juices. 
- grape juice, is becoming less acidic. 
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Hopefully this helped and good luck.