book Maths Puzzle Numerical Ability

I = p(1 + r) for r

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Can someone explain to me how to graph (x+2)�/9+(y-3)�/4=1 and other ellipses and how to find the equation of an ellipse from its graph? -2/3 d -1/5 (bd-ac) a=-2 b=4 c=-1 d=3