2. How do you calculate the maximum percentage of dioxygen to be used in a nitrox mixture?3. Why is the max depth of a dive in the air established at 60 m?4. If a person inhales pure dioxygen at sea level will it exceed the threshold of toxicity of dioxygen? Explain.5. How do you determine the number of decompression level needed while going back up the surface?6. How do you calculate the time needed to reach a maximum depth?7. How do you calculate the duration of a dive up to the moment where the diver decides to resurface?8. What formula allows you to calculate the quantity of air needed to dive at a given depth?