4/x^2-7x + 1/z^2-4x-21 What is the least common denominator of the rational expression

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

Find the area of the unshaded square

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.