Is it punctuated correctly or incorrectly

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

Constructed response paragraph: in the short story, the author describes her life during her “day away” but provides few details about her “normal” life. using information from the text, write a short story that describes events that precede the story above. as you detail the author’s daily routine before her “day away,” be sure your narrative establishes the story’s setting, first-person point of view, and primary conflict.

Kyle and his brother have a marble set of the marbles 12 are blue this represent 50 over a hundred of all the marbles what decimal is equivalent to 50 / 100