Answer:
3.5 m/hr   
Step-by-step explanation:
2 + c   =   5 -c           c = speed of current 
2 c = 3      c = current speed = 1.5 m/hr 
                          your speed =   5 - 1.5    (or  2 + 1.5)  =  3.5 m/hr 
 
        
             
        
        
        
Answer:
5cm
Step-by-step explanation:
 
        
             
        
        
        
Answer:
centroid is (2,5)
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Mr X
Step-by-step explanation:
his identity is a variable ; it could be anybody of the male gender. 
all the other ones denote known designations, i.e, B+ grade