What are the removable discontinuities of the following function?

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect