Hi,
The sum of ten and a number. 
Usually AND refers to adding, that's just the rules of math according to writing equation. Times would be multiplying, taking away is subtraction and divided by is dividing.
So if the question uses AND, it's adding.
A
 
        
             
        
        
        
What would you like to know? The total surface area? The lateral surface area? The volume, perhaps? The radius?
 
        
             
        
        
        
Answer:
Step-by-step explanation:
 
        
             
        
        
        
Answer:
64= 39+x
Step-by-step explanation:
x represents the unknown or in this case the money made to get to 64 
39 is what she started with and 64 is the final total 
 
        
             
        
        
        
Answer: the first one
Step-by-step explanation: just trust me ;)