- 4x^2-19x-5 completing the square?

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A balloon contains 425ml of g at 20.95°C A student places the balloon outside it sits for manyhours at a temp of 5.60°C. Assume no charge? What is the minimum number of terminal atoms that must be bonded to central atom in order for a molecule to form a three dimensional shape? Calculate the pH of a solution that has a H+ concentration of 1.20 x 10-3 M.? How did great barrier reef form? If input impedance of an amp is 20 kOhm, what is the recommended impedance of the input line?