Write in simplest form (2(3/8)+1(3/4))+5(7/8)

Use the x-intercept method to find all real solutions of the equation.x^3-10x^2+27x-18=0

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What is the multiple zero and multiplicity of f(x) = (x ? 3)(x ? 3)(x + 5)? multiple zero is 3; multiplicity is 2 multiple zero is 5; multiplicity is 1 multiple zero is ? 5; multiplicity is 1 multiple zero is ? 3; multiplicity is 2