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baabaagreysheep
For the circle of 3x² + 3y² = 75, the radius would be 5, and the center would be (0, 0)

This is because, usual circle equations have only 1 x² and y², so you can divide all terms by 3 to make the equation look normal. This gives you x² + y² = 25.

Since there is nothing being added or subtracted to the x and y values, the center is (0, 0), and the radius is the square root of whatever the values equal, which is √25 = 5.

I hope this helps!
The formula of a circle is (x-h)^2+(y-k)^2=r^2, where (h,k) is the center.
The center is (0,0) because there is no occurrence of h or k
The radius is [tex] \sqrt{75} [/tex] bcause [tex] \sqrt{75} [/tex]^2 is 75

:)