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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I am in need of some help

Use the ac test to determine if the following trinomial can be factored.
X^2+2x+3

Thank you WHAT PERCENT OF 144 IS 126?