- How to balance equations?

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Can the human body win against caffeine? How is oxygen developed? An object is located 23 cm from a diverging lens with a focal length of 20 cm determine the image distance? A 15m solution of ab acid base has a Ka of 7.5 x 10 ^-3.Explain how you would classify this solution in terms of concentration and strength.? Would you be so kind help me please? It's about number theory.. Thank you very much before..?