book Maths Puzzle Numerical Ability

find the x-intercept and y-intercept of the line -x+7y=21

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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... I need help factoring the following problem

32a^4b - 50b^3

thanks