Please help me answer these . will give brainliest . sorry if it’s blurry

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

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

What is the solution set for z+10=z-2