exam Maths Puzzle Numerical Ability

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.

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-4 sq root3 - sq root36 + 3 sq root 48 =? 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?