←→ is parallel to cd←→. ac and bd are perpendicular to ab←→ and cd←→ . what is the relationship between ac and bd ?

Pls! does anybody know a shortcut for answering these types of questions in the future?

The angles below are supplementary. what is the value of x? a pair of supplementary angles is shown. one angle measures 7x + 33, and the other angle measures 70. 5.3 8.14 11 14.7

Antonia and carla have an equivalant percentage of green marbles in their bags of marbles. antonia has 4 green marbles and 16 total matbles. if carla has 10 green marbles , how many total marbles does carla have