Answer: a=10
Step-by-step explanation:
Answer:
x = 20
Step-by-step explanation:
By exterior angle theorem, we have:

Answer: Second option: 8/21
Solution:
P(1) = (Number of times we get 1) / (Total number of results)
Number of times we get 1 = 8
Total number of results = 21
P(1)=8/21
Answer:
A. The lines stay parallel
Step-by-step explanation:
Rigid transformations do not change angle or line relationships. When the parallel lines are rotated they stay parallel. Reflecting them will keep them parallel. If this were not true, then figured with parallel lines like rectangles and squares would change shape when reflected.