exam Maths Puzzle Numerical Ability

Could someone please help me figure out the equation of the parabola given the Focus (-3,5) and directrix y=8

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exam Other Question

Please could someone help with the following question:

If log {100√x}over y(4) = a log x + b log y + c, find the values of a, b and c.

I would be very grateful if someo Express the expression log2x^3z/y^2 in terms of logarithm of x, y, and z.