exam Maths Puzzle Numerical Ability

The equation of Circle P is X squared + Y squared - 6x + 4y= 21, and the equation of circle Q is X squared + y squared - 8x + 10y = 11. How do I find the difference between the centers of these circles?

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exam Other Question

The width of a rectangle is 3 inches less than one-half of its length. If the perimeter of the rectangle is 42 inches, find the area of the rectangle. If the path is 12cm on the map how many km is the actual path on a scale of 1:10,000 in cm?