- Positive effects of chemical reaction by mankind?

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How can we eradicate cholera in our communities? IONIC EQUATION OF SODIUM CHRORINE REACTING WITH SILVER NITRATE? What is the range of this function and how do you find it? The function is f(n) = √(4-n^4)? A position given by:
r = [2.0m+(5.0m/s)t] i + [3.0-(1.0m/s^2)t^2] j,
What is the magnititude of the acceleration of the object at time t=2s? Cual es la fundamentación teórica de la grafología?