Answer:2
Step-by-step explanation;
A vertical line has an undefined slope.
vertical lines are X= something
in this case it needs to intercept 9.
so it is X=9
Answer:

Step-by-step explanation:
From the question we are told that:
Percentage of audience in first concert 
Percentage of audience in second concert 
Percentage of audience in third concert 
Audience Percentage at at-least one concert 
Percentage of audience at first & second concert 
Percentage of audience in first & third concert 
Percentage of audience in second & third concert 
Generally the equation for probability of attending all concerts
is mathematically given by




Therefore the probability that a randomly selected audient attended all the concerts

Answer:
B) 131°
Step-by-step explanation:
-4a + 139 = 4a + 123 because they are vertical angles
-4a + 139 = 4a + 123
reduce:
8a = 16
a = 2
4(2) + 123 = 131°
D) 40% 2/5=40 so 40 percent chance