The picture below shows a right-triangle-shaped charging stand for a gaming system: the side face of a charging stand is a right triangle labeled abc. The measure of angle acb is 90 degrees, and the measure of angle abc is 55 degrees. The height of the stand is 7 inches. Which expression shows the length, bc, of the base of the stand? 7 over tan 55 degrees 7(cos 55°) 7 over sin 55 degrees 7(tan 55°).