Proving problem is NP-complete

Hey Im trying to prove that these problems are NP complete.

Im trying to map them all to the Travelling Salesman problem.

** Dense subgraph Problem**

Input: A graph G, and integers k and t.

Output: Does G contain a subgraph with exactly k vertices and at least t edges?

**Clique, no-clique Problem **

Input: An undirected graph G = (V;E) and an integer k.

Output: Does G contain both a clique of size k and an independent set of size k.

**Dominating Set Problem **

Given a graph G = (V,E) a *dominating set* of G is a subset V' of V such that for each vertex

*v* $\displaystyle \in$ V \ V ' there exists a vertex *v*' $\displaystyle \in$ V ' such that (*v; v'*) $\displaystyle \in$ E. Show that determining if G has a dominating set of size k is NP-complete.