Tanjiro uses Water Breathing, Eleventh Form: Dead Calm. If the total water molecules he manipulates are directly proportional to his focus (F) and inversely proportional to the square root of his fatigue (T), and he manipulates 500 molecules when F=10 and T=4, how many molecules does he manipulate when F=15 and T=9?

Nezuko's Blood Demon Art, Exploding Blood, doubles the demon's regeneration speed every 5 minutes. If a demon initially regenerates at a rate of 2 HP/second, how many HP/second will it regenerate after 20 minutes?

Zenitsu's Thunder Breathing, First Form: Thunderclap and Flash, covers a certain distance (D) in a straight line. The time (t) it takes him is inversely proportional to his speed (v). If he covers 100 meters in 2 seconds, how long would it take him to cover 150 meters if his speed increases by 25%?

Inosuke's Beast Breathing techniques involve unpredictable movements. If the probability of him successfully landing a hit with any given strike is 0.7, and he throws 5 strikes independently, what is the probability that he lands exactly 3 hits?

Kanao Tsuyuri's Final Form: Equinoctial Vermilion Eyes increases her perception. If her reaction time decreases exponentially with training, and her initial reaction time is 0.5 seconds, and after 1 week it is 0.25 seconds, what will her reaction time be after 3 weeks, assuming the same rate of decrease?