exam Maths Puzzle Numerical Ability

Find the pH if H+ = 2.68 * 10^-3 mole per liter. (pH = - logH+ or 10^-pH = H+)

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exam Other Question

Find all solutions to the equation cos x = -1. The point-slope form of an equation of a line is represented by y-y1=m(x-x1). What can be used to determine the slope?