Book Maths Puzzle Time and Work

If 23.00 grams of a 45.00 gram sample of unknown isotope remain after 17 days 12 hours, what is the half-life of the unknown isotope to the nearest minute?

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Book Other Question

HOw do I solve log16 2=w What is the definition for the "root of the equation" when doing algebra?
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THE ZERO OF THE QUADRATIC FUNCTION, THAT IS, VALUES OF X WHICH F(X)=0, ARE THE ROOTS OF THE EQUATION.