Nthe problem-solving process, the step that identify what needs to be solved is weighing disadvantages. implementing the solution. weighing advantages. gathering information.

In the problem-solving process, the step that helps identify what needs to be solved is gathering information. You have to gather enough information in order to clearly identify the problem. When it is already defined you can analyze it and try to find some possible solutions (weighing up pros and cons). The last steps are to pick the best solutions and to implement them to see if they work.

3. i would say one, but one is not prime nor composite.