determine if the following are homomorphisms/isomorphisms:
1. F: (Z5,+5) ?(Z5,+5) whereF([x]5)=[2x+1]5.
2. F : (Z10,+10) ?(Z5,+5) where F([x]10)=[2x]5.
3. F : (Z31,+31) ?(Z31,+31) whereF([x]31)=[7x]31.
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