- (5y)^2 (5y)^5?

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Prove that 1-x^(2)/1+x^(2)=x^(2)-1/x^(2)+1? 30 mL of 0.05 M EDTA was required to titrate 25 mL of K in water. Calculate the concentration of K in ppm. (The atomic weight of K is 39.1)? How do I find the compass heading/bearing? Which of the following models of the atom reflects the unpredictable motion of the electron? 3.4E-7 BTC?