Answer:
a. 5i + 13j 
b. 8i
c. 10i + 6j
Step-by-step explanation:
a. 2i + 6j + 3i + 7j = 5i + 13j
b. 3i + 7j + 5i - 7j = 8i 
c. 2i + 6j + 3i + 7j + 5i - 7j = 10i + 6j
 
        
             
        
        
        
See photos for solutions and steps :)
 
        
        
        
Answer: (0,-15)
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Explanation:
Add up the x coordinates to get 1+(-1) = 0. Divide this sum in half to get 0/2 = 0. Therefore the x coordinate of the midpoint is 0.
Repeat for the y coordinates. First add the y coordinates to get -7+(-23) = -30. Then divide that result in half to get -30/2 = -15. So the y coordinate of the midpoint is -15.
Overall, the midpoint is (0,-15).
        
             
        
        
        
Answer:
C words
Step-by-step explanation: