Answer:
Kayla is correct The center is a fixed  point in the middle of the sphere
Step-by-step explanation:
In mathematics we have certain habit of rules for notation of points, coordinates, segments, angles and so on.
Usually we denote points,  by letters even more we denote with the first letter of the object we are denoting
 Occasionally, we also denote  segments as radius in a circle and in a sphere, with letters,  that is r stands for  radius, h stands for height, in most cases we denote point for capital letters ( in a segment)  
 When we denote radius, with small letter it should be placed at the center or over the segment we are traying to denote.
For points we only need to place the letter close to the to the point we want to denote. 
Therefore Kayla is correct when says that c stand for " the center of the sphere"
 
 
        
                    
             
        
        
        
Answer:0,3 for y and 4,0 for x
the second one is 0,6 for y and for the x it will be -3,0
Step-by-step explanation:
 
        
             
        
        
        
Answer:
131 points
Step-by-step explanation:
Apex. Sad nobody came in clutch for me 
 
        
                    
             
        
        
        
Answer:
9+15i
Step-by-step explanation:
 
        
             
        
        
        
7x9=63
63÷2= 31.5x4
126= area of the triangles
7x7= 49= area of the square. 
126+49= 175 ft