Answer:
25
Step-by-step explanation:
 
        
             
        
        
        
Answer:
65 degrees
Step-by-step explanation:
The angles will sum up to 360, just do 360 - all known angles
360 - 90 - 128 - 77 = 65
 
        
                    
             
        
        
        
Answer:
12
Step-by-step explanation:
Listing the weeks he will attend each item
Class  4,8,12,16
Chess 2,4,6,8,10,12
Fencing 3,6,9,12
Starting today at week 0, he will attend all 3 again at week 12
 
        
                    
             
        
        
        
Answer:
   x = 5
Step-by-step explanation:
The corresponding segments are proportional, so you can write any of several equations relating the different segment lengths. Here's one way:
   top segment/bottom segment = x/(x+5) = (x-2)/(x+1)
Multiply by the product of denominators:
   (x +1)x = (x +5)(x -2)
   x² +x = x² +3x -10 . . . . . eliminate parentheses
   10 = 2x . . . . . . . . . . . . . . add 10 -x -x² to both sides of the equation
   5 = x . . . . . divide by 2
 
        
             
        
        
        
Answer:not sure sorry
Step-by-step explanation: I need points