How do writers support their points in a research paper?

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

Why does a coyote decide to take care of bill and if you need the story’s name it is pecos bill

The difference between the present reservoir, with its silent sterile shores and debris-choked side canyons, and the original glen canyon, is the difference between death and life. glen canyon was alive. lake powell is a graveyard. which word best contributes to the author’s sad tone?