First, find where would the point P(x,y) would land after applying the transformatios r and R:
[tex]R(r(P))=R(r(x,y))=R(x,-y)=(-x,y)[/tex]Notice that it would be enough to flip the sign of the first coordinate to send (-x,y) back to (x,y).
Then, the transformation that moves R(r(P)) back to P is:
[tex](x,y)\rightarrow(-x,y)[/tex]Therefore, the answer is:
[tex](-x,y)[/tex]