Answer:
11. 
12. 
13. 
Step-by-step explanation:
11. 
Using Formula:


12. 
Using Formula:


13. 
Using Formula:


Answer:
1/9
Step-by-step explanation:
Since Dan has 20 rings and 9 hats out of which 5 hats are blue and 4 rings are red, there is a 5/9 x 4/20 chance that he will pick those two. When you simplify the fractions you get a 1/9 chance that Dan will choose such options.
Answer:
0
Step-by-step explanation:
if they have the same slope then they never intercept