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Homework Statement
I'm doing my best to figure out how these answers were worked out. We discussed it as a class but then moved on to another topic and after that, I just lost it because of the topic I'm doing right now.
I basically need to explain how these answers can be worked out.
Homework Equations
I have a screenshot of the powerpoint slide which was used and we were asked to calculate the answer. How would the answers be calculated?
The Attempt at a Solution
I have had an attempt at it and I was fairly good at this but once we started a new topic, I just lost all knowledge of it.
Please explain how I can work out the answers again.
Thanks!