exam Maths Puzzle Numerical Ability

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there it says....
John invests $380 for years at 5% per year simple interest.How much interest does h

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3.5x + 23.6 > 59.0 - 8.3x 1.Prove that the points A(6,-13),B(-2,2),C(13,10), and D (21,-5) are vertices of a Square (hint: take note of the characteristics of a square). also, find the length of a diagonal.