Be quick select the expression equal to (picture)

What is always true about a positive integer raised to a negative odd power?

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

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.