When constructing inscribed polygons and perpendicular lines how are the steps similar

Solve the triangle. a = 21°, c = 105°, c = 5

What’s -11-33k and factor each expression completely

Your company will replace the asphalt roofs on all the buildings at the factory complex shown below. the buildings have flat roofs. you charge according to the total roof area. what is this area, in square yards?