book Maths Puzzle Numerical Ability

I previously today asked the question

How many three letter words can be formed using the word: MANAGEMENT? Where the words do not have to be real words, just any three letters

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I need to know how to solve this problem. The question is Find the equation of the line that satisfies (2,3) Slope: 1 Use synthetic division to find the value of f(-2)for f(x)=x^3 - 3x^2 - x - 9