exam Maths Puzzle Numerical Ability

Please help

Give the equation for the circle with center c(3,-2) and radius 4.

Please show me how to do this

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exam Other Question

Row 1 x = 10
Row 2 1/2 x = 10
Row 3 1/3x = 10
Row 100 1/100x = 10
Row n ? x = ?

As n gets larger, to what equation are the equations getting closer and closer? What is happening to the solutions? N to the second power = 225