exam Maths Puzzle Numerical Ability

It says to Factor completely:
x^3-5x^2+7x-35

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exam Other Question

Hi and thank you for your help if you can.

My problem is an intermediate algebra problem

2-3[-4+6]/(-2) Simplify.

Nichell Bailey p.s I never know where to begin first. How do you find the height of a triangle with only side lengths given?