exam Maths Puzzle Numerical Ability

I need to verify ( ( x+2) (x-1) (2x-7)) these factos to see if they are corret either through long division or synthetic division.

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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. Please help with: The measures of the angles of a triangle are 3 consecutive even integers. Find the measure of each angle