The distance is 30 km and the displacement is 22.4 km North East
        
             
        
        
        
I believe you are right. pH is the concentration of H+. Therefore the more acidic the more H+.
        
             
        
        
        
Yes. There is a substantial number of people ... members of Brainly as well as non-members ... students, puzzle solvers, and just average educated thinkers, who would be able to solve it.