exam Maths Puzzle Numerical Ability

Find the equation of the parabola whose focus is (2,3) and directrix is x=12.

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exam Other Question

Please help. How do I determine ratios.

Ed and Dave are going to divide a cash prize of $14,000 in a ratio of 2 to 5. How much will Dave receive? Solve the system of equation:

3x+2y=11
2x-2y=4

Solve the system:

2x-y+2z=11
3x-2y-z=12
x-3y-z=1