- How does one do this concentration question?

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The point (4,4) lies on a circle whose center is at (0,1). How do I write the standard form of the equation of this circle? As one increases the resistance of a simple circuit without changing voltage, what happens to the current through that circuit? The area of a circle is given by (pi k squared minus twelve pi k plus 36 pie) square inches. What is the radius of the circle? The rate of change of y with respect to t is proportional to 50 - y? How are hallucinogenics not direct evidence of alternate realities?