Function Invertibility/Inverse & Calculus, One question. Early Uni/College level

Hi Part a) Just requires sentences to explain answer, can be short. Part b) & c) is just value but working is appreciated.

Thanks.

  • https://drive.google.com/drive/folders/1fvIbmcwXncNG7tg1k0Ox4XErj8iugTs7?usp=sharing

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