exam Maths Puzzle Numerical Ability

The vertices of a parallelogram includes (-3, 4), (5, 4) and (-1, -2). How do I find the fourth vertex? Please explain. This question is not from a textbook. I am studying for

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Ski Jump. The base of a ski ramp forms a right triangle. One leg of the triangle is 2 meters longer than the others. If the hypotenuse is 10 meters, then what are the lengths of the legs? 48. Vinegar has a hydronium-ion concentration of about 3.97 x 10^-3 mole per liter. Determine the pH of vinegar and state whether it is an acid or a base.