Question

plz help and thanks so much for it

Answer 1

b+c+(c-b)+(b-c). That is your expression.  b 11 c 16
       
          First, let's convert the variables to real numbers:   11+16+(16-11)+(11-16)
             Now, let's solve that equation.                                    11+16+5+(-5)
                      5+(-5) cancels out, so all we have left is:                   27
                That is your perimeter.