The radius of a circle is 4 millimeters. what is the circle's circumference?

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Select 2 statements that are true about the equation y+6=-10(x-3).1) the slope of the line is -102) the slope of the line is 33) one point on the line is (3,6)4) one point on the line is (3,-6)

Ten times the square of a non-zero number is eqaul to ninety times the number

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?