The data is most concentrated in the third quarter (second section of the boxed area).
We know this because each quarter of the data is represented by a section of the graph, and the smaller the range, the more concentrated the data.
Answer:
Option D is correct.
Value of z =5
Step-by-step explanation:
Given the equation: 
Using distributive property: 
Apply distributive property in the given equation we have;

⇒
Subtract 4 from both sides we get;
6z + 4 -4 = 34-4
Simplify:
6z = 30
Divide by 6 to both sides of an equation, we get;
z = 5
Therefore, the value of z is, 5
140 degrees is the answer.
Tangent touches the circle at 90 degrees. Since angles in a triangle add up to 180 degrees, 180 - (90+50)
angle BAD = 40
Supplementary angles add up to 180 degrees, so 180-40
= 140 degrees
Hope it helps :)