book Maths Puzzle Numerical Ability

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6x squared-6=5x

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book Other Question

True of false: A function f is decreasing on an open interval I, if for any choice of x1, and x2 in I, with x1 < x2, we have f(x1) > f(x2). The half-life of Bismuth is 5 days. Then 75% of an original amount will cease to be radioactive in 10 days. I believe that this one is true. Am I right?