book Maths Puzzle Numerical Ability

will you please help me factor this equation: 16k squared minus 80k plus 100. thankyou

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the hypotenuse of a triangle is 48 feet. what kind of triangle is it? a chemist mixes 10% hydrochloric acid solution with at 20% hydrochloric acid solution. how many milliliters of each should the chemist use to make a 600 ml solution that is 13% hyd