book Maths Puzzle Numerical Ability

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WHAT IS THE SLOPE OF A LINE THAT IS PERPENDICULAR TO THE LINE PASSING THROUGH THE POINTS (8,3) AND (10,6)?

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book Other Question
What is the degree of the polynomial 12xy^3-7y^2z^5+5x^6y-2X^2y^2 How do you solve and graph the inequality 17.2>13+0.7y?