exam Maths Puzzle Numerical Ability

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.

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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 How many pounds of chocolate at $3 per pound and peanuts at $ per pound must be mixed to produce 30 pounds of a party mix worth $2.80 per pound?