book Maths Puzzle Numerical Ability

I need this immediately for my H.W : The total surfac area of a cone is 616 sq cm.Its slant height i.e. length is equal to three times the radius of the base.Find its radius and slant height.

Please please please send the answer fast...

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Two angles are supplementary. The measure of the second angle is 45 degrees less than two times the measure of the first angle. Find the measure of each angle.

Please show me the formula and the steps to answer it correctly

pewe@quixnet.net I'm having difficulty finding the LCD for rational expressions. For example, how do I convert 4b/75ab, 6/105ab^2 to equivalent rational expressions with the lowest common denominat