Find the magnitude of angle A if cos A = 0.5

Is trapezoid abdc the result of a dilation of trapezoid mnpq by a scale factor of ? why or why not? yes, because ab and cd are each the lengths mn and qp. yes, because sides ab and cd are parallel to sides mn and qp. no, because ab is the length mn but cd is the length qp. no, because sides ab and cd have different slopes from sides mn and qp.

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?