exam Maths Puzzle Numerical Ability

Find the foci of the graph {{{y^2/25-x^2/49=1}}}. Draw the graph, nam the conic, foci, vertices, asymptotes, and the center.

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y^2+10y+21/y^2+12y+35 please show me how to simplify this expression and how to set it up correctly A dairy has 50 Gallons of milk that is 7.8 % butterfat. how much skim milk (no butterfat) should be mixed with it to make milk that is 2% butterfat?