book Maths Puzzle Numerical Ability

Find the area of a triangle whose vertices have coordinates (3,5),(6,-5),and(-4,10)

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book Other Question

Graph the parabola y = 2x^2 + 3x-2 showing its vertex and any x or y intercepts. Find the domain, range, and minimum. A rectangle has a length which is 3 more than its width. Write a polynomial P(x) which expresses the perimeter of this rectangle in terms of the width x.Help