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An isotope of the element, argon, has a mass number of 38. How many neutrons does it have? please explain? If the distance between vertex and directrix is 3 and the focus is (-3, 5) find four pairs of possible vertex and directrix.? Is it possible to transform a 1000 W Heating Element into 200 W or any other by splitting it into many pieces? A 240V RMS source is connected to a full wave rectifier. What is the value of the DC output? P(x ≤ 60) that x is a normal variable with mean of 49, and standard deviation of 7.1?