Answer:
8x
Step-by-step explanation:
3x+5x=(3+5)x
          =8x
 
        
             
        
        
        
Answer:
Step 2, he didn't add the values he completed the square with to both sides.
Step-by-step explanation:
When you complete the square, you need to add the values to both sides, not just one.
So when Homer added 49 + 1 or 50 to the left side of the equation, he should've also added 50 to the right side of the equation.
Hence, the equation would now be : 
(x-7)^2 + (y+1)^2 = 75
 
        
             
        
        
        
Answer:
50 miles per hour
Step-by-step explanation:
500 miles in 10 hours
 = 500/10
 = 50 miles per hour
 
        
             
        
        
        
Answer:
-21
Step-by-step explanation:
-3 * 7