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Is the story of Icarus a cautionary tale about space travel? 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? In regression equation, i don't know question No.2? How do I solve [f(x+3)-f(x)]/[x+3-x] when f(x) = 4-x^2? Bromocresol purple is an indicator that changes color over a range from pH=5.2 to pH=6.8. What is Ka of bromocresol purple?