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Maths C4 Rates of Change

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    Hi guys, I have no idea on how to tackle questions based on rates of change, e.g. liquid pouring and leaking.
    C4 edexcel review exercise 1 question 47 part c and d
    In addition I would appreciate if you could explain me on how to solve question 30 review exercise 1

    Perhaps you could tell us the question

    For the most part rates of change give you \frac{dx}{dt} = f(x) and you need to integrate


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