exam Maths Puzzle Numerical Ability

The length of a rectangle is 5cm more than its width. If the area of the rectangle is 70cm^2, find the dimensions.

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I need help solving this type of problem, it says to factor: 9x^2-25. the answer I got was(5+3x)(-5+3x)I need to know if that is right and if not please show me the steps so that I can understand how to do these type problems. Graph the trianlge ABC if it has the vertices A(8,6) B(-4,1) and C(2,-6) graph the triangle. Find the coordinates of J if AJ is a median of triangle ABC. If N has the coordinates (3,-4) is BN an altitude of triangle ABC?