book Maths Puzzle Numerical Ability

Can someone please help:

Write the equation of the circle with the given center and length of a radius. Express the final equation in the form X^2+Y^2+Dx+Ey+F=0
cCenter at (3,5) and r=2

Thanks
Charmaine

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book Other Question
The length of a rectangle is twice the width. The perimeter is 48 in. Find the dimensions of the rectangle? Complete the following statement x^2 + 2x - 80 = (x+10) ( )

This one is comfusing.

Can someone help please.

Thanks