Trapezoid ABCD is rotated on 180° about the origin. Draw the image A'B'C'D' of the given trapezoid and determine which of the following statements are true?
Select all correct statements.

A.
A'D'
∥
B'C'
B.
A'B'
∥
D'C'
C.
AD
∥
A'D'
D.
A'B'
∥
AB
E.
AD
∥
B'C'

Twenty percent of what number is 40?

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

Twelve less than a number is at most 20