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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directions: find angle x. the first to angles are 116 degress and the other angle is 37 degress. my answer was 27 degress. am i correct? Describe the end behavior of the graph of the function f(x)=2x^3 - 8x + 1?