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How to describe these 2 different types of graphs? (A-level)

How do u describe a graph that starts off decreasing fast then starts to decrease slowly? What abt one that starts off increasing fast but then starts increasing less slowly?
Please answer while obeying the typical mark scheme (question is like 'describe the general trend'
i'd imagine something like
1) positive or negative correlation 2) desccribe graph which is what my questions centres 3) explanation why or using specific values and/or a calculation
Exponential

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