exam Maths Puzzle Numerical Ability

If c varies inversely as d, and if c=12 when d=1/4, find c when d=9?

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exam Other Question

i need help adding this rational expression with unlike denominators:
6(4x-3)/3-4x - 4(3-x)/4x-3 + -8(x+2)/3-4x do you first multiply three minus four x times four x minus three Find the vertices and foci of the ellipse given by
x^2+9y^2-24x+18y+9=0
x^2-24x+9(y^2+2y)=-9
x^2-24x+144+9(y^2+2y+1)=-9+144+9
(x-12)^2+9(y+1)^2=144
(x-12)^2/144+(y+1)^2/16=1