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Oxygen has three stable isotopes: O-16, O-17, and O-18. O-15 is not a naturally occurring stable isotope of oxygen; it is radioactive.
I. 35x² - 46x – 16 = 0
II. 35y² - 116y + 96 = 0
I. 8x² - 78x + 169 = 0
II. 20y² - 117y + 169 = 0
I. 2x2 + 5x + 2 = 0
II. 4y2 = 1
I. 14p2 – 135p + 81 = 0
II. 7q2 – 65q + 18 = 0
I. 6y2- 17y + 12 = 0
II. 15x2- 38x + 24 = 0
I. x2 + x – 42 = 0
II. y2 + 6y – 27 = 0
I. (y – 5)2 – 9 = 0
II. x2 – 3x + 2 = 0
I. x2 + 13x + 42 = 0
II. y² + 13y + 40 = 0
Solve the quadratic equations and determine the relation between x and y:
Equation 1: x² - 24x + 143 = 0
Equation 2: y² - 26y + 165 = 0
I.70x² - 143x + 72 = 0
II. 80 y² - 142y + 63 = 0
