Answer:
I am so sorry
Step-by-step explanation:
I dont really know what it is but I think it is 21.98 you do 7 times 3.14
 
        
             
        
        
        
Answer:
The other end point is: s+ti = 3+9i
Step-by-step explanation:
Mid-Point(M) in the complex plane states that the midpoint of the line segment joining two complex numbers a+bi and s+ti is the  average of the numbers at the endpoints.
It is given by:    
Given: The midpoint = -1 + i and the segment has an endpoint at -5 - 7i
Find the other endpoints.
Let a + bi = -5 -7i  and let other endpoint s + ti (i represents imaginary )
Here, a = -5 and b = -7 to find s and t.
then;
 [Apply Mid-point formula]
     [Apply Mid-point formula]
On comparing both sides
we get;
 and
  and  
To solve for s:
 
 
or
-2 = -5+s 
Add 5 to both side we have;
-2+5 = -5+s+5
Simplify:
3 = s or
 s =3
Now, to solve for t;

2 =-7+t
Add 7 to both sides we get;
2+7 = -7+t+7
Simplify:
9 = t
or
t =9
Therefore, the other end point (s+ti) is, 3+9i
 
        
                    
             
        
        
        
Step-by-step explanation:
17) 3x+5-12+4x+2x
 3x+4x+2x +5-12
 8x-7
 if x =6
 8*6-7 =48-7
 = 41
18.) 9(3x-4y+8)
 27x-36y+72
 
        
             
        
        
        
X = 4, You subtract the 5x to the other side then divide the 32 by 8 to get 4.
        
                    
             
        
        
        
EXPLANATION:  (2x6)-10)+2(4x13+(12-20)
ANSWER:  (20x14)=280 thats what i got lmk if its incorrect