Heather is sitting in a movie theater, 19 meters from the screen. The angle of elevation from her line of sight to the top of the screen is 15°, and the angle of depression from her line of sight to the bottom of the screen is 22º. Find the height of the entire screen

What are the steps to solving the inequality 3b + 8 ≥ 14?

How is the number of vertices for a prism related to the name of the prism

Statements reasons 1. ab ? cd; ad ? bc 1. given 2. ac ? ac 2. reflexive property 3. ? adc ? ? cba 3. ? 4. ? dac ? ? bca; ? acd ? ? cab 4. cpctc 5. ? dac and ? bca are alt. int. ? s; ? acd and ? cab are alt. int. ? s 5. definition of alternate interior angles 6. ab ? cd; ad ? bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?