I NEED HELP ON THESE LAST QUESTIONS PLEASE !!

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

Read the following excerpt from the play a raisin in the sun by lorraine hansberry: johnson (this usa woman who decided long ago to be enthusiastic about everything in life and she is inclined to wave her wrist vigorously at the heigh of her exclamatory comments.): hello there, yourself! h’you this evening, ruth? which assumption about johnson is most likely true based on the stage direction? a. her enthusiasm is used to mask her fear of public places

What is the common difference between successive terms in the sequencer 0.36,0 26,0 16,006, 0,04,0