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Hello CAIR-
In this post, and others, you have posted lots of questions here. I don't think this forum is here to do your homework for you, but to help you when you've tried, but you can't solve a particular problem.
Would you like to show us what you've done and where you get stuck, and we'll take it from there.
Grandad
There not homework questions but pre-exam questions to help us work towards preparing for the final which is tomorrow.
I watched this forum for a while and many people were helped, similar questions will show up and I want to see the methods used to solve some of these questions.
I've attempted a few but out of the 75 we have the ones I posted were key questions that showed up on last years exam. I just need some help