Answer:

Step-by-step explanation:
we know that
The <u><em>Midpoint Theorem</em></u> states that the segment joining two sides of a triangle at the midpoints of those sides is parallel to the third side and is half the length of the third side.
so
In this problem

solve for x
Multiply by 2 both sides

subtract 2x both sides


Adds 1 both sides

 
        
             
        
        
        
Answer: 17
21-4=17
4+17=21
21+17=38 and so on..
        
             
        
        
        
ik the first answer choice is false
 
        
                    
             
        
        
        
If you had one row, you would have 22 chairs.
If you had two rows, you would have 22+22=44 chairs.
If you had three rows, you would have 22+22+22 chairs, or 66 chairs.
See the pattern?
If you had 40 rows, you would add 22 40 times, or 22*40=880 chairs.
Hope this helps!
        
                    
             
        
        
        
T = c + cb
t - c = cb
(t - c)/c = b
b = (t - c)/c