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My answers are in red. Did I do these correctly? It seemed too easy. I think bii) might be wrong. If any are wrong i'd appreciate the correct way of doing it, thanks.

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    The last one doesn't seem correct.$f(9)=8$ – 2017-01-06

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All are correct except for cii), where either $f(9)=8$ or $f(9)\ d.n.e$.

There is a hole at the coordinate $(9,5)$ and $f(x)$ in this graph resembles $3[\frac{x+3}{4}]-1$ where $[\ ]$ is floor function.

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    I can't see why it would be 8, can you explain please? – 2017-01-06
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    Added explanation. – 2017-01-06