Answer:
A. 
isosceles, right
Step-by-step explanation:
perpendicular lines means that they make 90° angle with each other and for a triangle to be isosceles it has to have 2 sides of equal length
 
        
                    
             
        
        
        
9514 1404 393
Answer:
   6
Step-by-step explanation:
Any of the three can be in first place.
Any of the remaining two can be in 2nd place.
The remaining swimmer will be in 3rd place.
There are 3 × 2 × 1 = 6 possible orderings of the swimmers.
  
        
             
        
        
        
Answer:100
Step-by-step explanation: 
2 x 2.4=4.8
4.8+3.2=8.0
15.5 x 8.0=124.00
124.00-24=
100
 
        
             
        
        
        
18 is an even number because if you divide 18 ÷ 2 = 9 it guves you an odd number
        
             
        
        
        
Answer:
Step-by-step explanation:
B