exam Maths Puzzle Numerical Ability

How can I simplify 4x^-6y^-2 ??

thanks!

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exam Other Question

At 5 pm Roger zoomed off from Asteroid. One hour later, Maryanne zoomed off from Asteroid in the opposite direction at a speed 400 kph less than that of Roger. If they were 7900 km apart at 11 p.m how fast did each travel? Is the given number a solution of the equation?
C + 5 = 3;-2