Answer: 25 
explanation:
7² + 24² = c² 
49 + 576 = c² 
625 = c² 
c = √625
c= 25
or just know some pythagorean triples
        
                    
             
        
        
        
5•6 = 30. 
She needs to buy 30 flowers from the store.
        
                    
             
        
        
        
Answer:
C) 17
Step-by-step explanation:
Using the rule 
A^2 + B^2 = C^2 
8^2 + 15^2 = x^2
64 + 225 = x^2
x^2 = 289
x= _/-289
x = 17
 
        
             
        
        
        
Answer:
52 and  38
Step-by-step explanation:
If x = 13 then 4x = 4 * 13 so 52.  
Same for the next one.  2x = 2 * 13 so 26.  26+12 is 38.  
Done...