Can u help me with this pls..?

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

Ineed simplifying this thesis and making it easier to understand for the reader (more concise) "no matter how religious one may be, one’s faith tends to change under unexpected and challenging circumstances."

Which bibliography entry is written correctly and completely? a. johnson, marie. the solar age. chicago: energy options press, 2014. b. front page story. houston chronicle. 5 apr 2013. c. “will solar work? ” science news. march edition. d. friends of solar. mother earth society, accessed 15 jan 2014.