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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If;- x/7= y+4z/(2z-(x+r/2)) +(9t/6t) what is the value of x if p/r is 4.76785? suppose 2.4 million lbs of almonds are sold when the price is $5.50 per pound and 4.8 million lbs of almonds are sold at $4.50 per pound. find a linear function, A(p), that expresses the amount of almonds sold as a function of the price per pound.