Please help. Thanks!

Use the set identities given in the table to prove the following new identities. Label each step in your proof with the set identity used to establish that step. 1) S(ST)=ST 2) S(TT)= 3) ST=ST uestion IV: (20 points) Find the following : 1) Indicate whether the functions defined below are one-to-one, onto, neither, or both: i) h:ZZ.h(x)=x5. ii) t:ZZt(x)=4x. 2) Floor of (7.6) 3) Ceiling of (9.7) 4) f:RR, where f(x)=x+5. What is f1