Answer:
Steps 1 - 4 below explains it. 
Step-by-step explanation:
The way that the soldiers get across the river and leave the boys in joint possession of the boat is;
1) The two 12- year - old boys will take the boat to the other side
2) Thereafter, one of the 12- year - old boys will return with the boat. 
3) A soldier will now take the boat to the other side and the soldier will remain there while the other boy returns the boat. 
4) Step 1 - 3 is a total of 4 trips. Thus, trip would be repeated the total of n times and the n number of soldiers would get across the river and leave the boys in joint possession of the boat after the total of 4n trips.
 
        
             
        
        
        
Answer:
173.83
Step-by-step explanation:
17.4 * 9.99
173.826 ~ 173.83
 
        
                    
             
        
        
        
Parallel:  the lines have = slopes.  We thus need 5/6 to equal 2/p.  then 5p must equal 12, and p = 12/5.   (answer)
Check:  Is 5/6 = 2 / (12/5)?  YES
Perp.:  The lines have slopes that are negative reciprocals of one another.
Then -6/5 = 2/p,  or
 -6      2
---- = ----
  5      p             Thus, -6p = 10, and p = -5/3   (answer)