exam Maths Puzzle Numerical Ability

The graph of a quadratic function f is the graph of y=-2x^2 translated 4 units to the left and 6 units down. What is the equation of function f?

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Martina Leaves home at 9 A.M., bicycling at at rate of 24/mi/h. Two hours later, John leaves, driving at the rate of 48 mi/h at what time will John Catch up with Martina?
What is the least positive number that you can divide by 7 and get a remainder of 4, divide by 8 and get a remainder of 5, and divide by 9 and get a remainder of 6?