Given:   ab || dc and m∠2 ≅ m∠4 prove: ad || bca. m∠1 = m∠4 b. m∠2 = m∠3 c. m∠1 + m∠4 = 180° d. m∠2 + m∠3 = 180°

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Which of the following parabolas opens down?

How would you find the height of points on the circle? the topic is trigonometry.