- What are the zeros for the function f(x)x^3-5x^2-4x+20?

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Please help with precalculus awarding best answer? Inverse trigonometry function problem? Water is just a ? Part of our atmosphere? Is there some numerical value what represent how well the elements(like chlorine,sodium) react? How many moles of H+ ions are present in 102.9 mL of 0.42 M nitric acid? Enter to 4 decimal places.?