Functions: Mixed exercises
              Mixed exercises
  Mixed exercises 
                    
    The surface area #A# of a cylinder in terms of its radius #r# and height #h# is given by \[A=2\cdot \pi \cdot r^2+2\cdot \pi \cdot r \cdot h\]If the height of the cylinder is #6# meter(s), express the radius as a function of the surface area #A#.
                        | #r(A)=# | 
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