There's no specific way to answer either question. However, there's no need to worry about introductions or conclusions, just make sure you talk about purpose, audience, register, context etc. in the text. In categorising texts just have separate paragraphs for separate points/pairings and analyse them before going onto the next. For Language and power/gender/technology give a brief introduction then begin analysing, bringing in different theorists/etc. as you do.
I can show you some model answers/own work I've done if you'd like?