Jerry bough a box of donuts and ate half of them himself. He gave one to each of his two sisters and had one left. How many donuts did he buy? Please help me. I need the answers ASAP, I would really appreciate it!

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.