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

Which of the following best describes the proper use of a "works cited" page? (a)-a works cited page is not needed if you paraphrase your research. (b)-a works cited page is not needed if you use signal phrases. (c)-a works cited page is optional when writing a researched text. (d)-a works cited page is required when writing a researched text.

Which is not covered under the common topic “relationship” a. causes and effects b. comparisons and contrasts c. contraries and contradictions d. antecedents and consequences