Book Maths Puzzle Algebra

What is the single logarithm of ln 5 +2ln x-3ln(x2+1)?



What is the single logarithm of 2log5x+3log5y-4log5z

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Please Help....solve using the quadratic formula...-x^2 -3x+5=0 How many liters of a mixture containing 80% alcohol should be added to 5 liters of 20% solution to yield a 30% solution?