1. \\( f(x)=2x\\) is order-preserving, \\(f(x)=-x\\) is not.

2. \\( f(x)=x+2\\) is metric-preserving, \\(f(x)=2x\\) is not.

3. \\( f(x)=-x\\) is addition preserving, \\(f(x)=x+2\\) is not.

2. \\( f(x)=x+2\\) is metric-preserving, \\(f(x)=2x\\) is not.

3. \\( f(x)=-x\\) is addition preserving, \\(f(x)=x+2\\) is not.