Answer:
your answer is 7.5 meters sorry i got to this late
Step-by-step explanation:
 
        
             
        
        
        
C) $20
40 divided by 30 is 1.3 
1.3 times 15 is 30
        
             
        
        
        
Letter A 
because we should add the two smaller number in the radical and if the sum equals to the other one. Then, it is a right triangle