Why is this NOT a function?

What is, because every input doesn't have only one output (ex: -2 has 2 outputs)?
Identify the MAXIMUM:

What is 8?
Using the graph below, find and interpret the value of D(3) in context.
What is "after 3 minutes, you are 400 meters from home"?
Lynn has a hairstyle with bangs. Lynn usually has her bangs trimmed every three months. The graph at the shows the growth of her bangs over the past year.
What is the RANGE?
What is 2≤y<8?
What college did Mr. Kaiser attend for undergrad?
The University of Wyoming
Which of the following relations DO represent functions? 
What is relation A and D?
Find the INCREASING INTERVAL:

What is 0<x<2?
How long did it take Juan to finish the 4 mile race? Include units!
What is 13 minutes?
Identify the MAXIMUM: 
What is NONE?
What is Mr. Kaiser's favorite color?
Green
Given f(x)=2x-5 , find f(-3) .
What is
f(-3)=-11?
Identify the RANGE (use appropriate notation):

What is
0<=y<\infty ?
How much time had passed when Juan and Antonio were the same distance from the starting line? 
What is 7 minutes?
Find the MAXIMUM:

What is 5?
What college does Mr. Kaiser attend for grad school?
The University of Central Florida
Use the table below to find x given g(x)=-2 .

What is
x=-1?
Identify the DOMAIN (use appropriate notation):

What is -5<x<=5 ?
Which story matches the graph: 

What is C?
Identify the DOMAIN AND RANGE (use appropriate notation):

What is -6<=x<8 and -7<=y<=9 ?
Which country did Mr. Kaiser live in besides the United States?
Australia
Given k(x)=-3x+1 , find x if k(x)=10 .
What is
x=-3.
Identify the DECREASING INTERVAL(S) (use appropriate notation):

What is 1<x<\infty ?
Below is a graph showing Ariel's hiking elevation as a function of time.
What elevation above sea level is Ariel at when he begins his hike? Include units.

What is 5 ft?
Identify the DOMAIN AND RANGE (use appropriate notation):

What is -7<=x<7 and -8<y<=8 ?
What is Mr. Kaiser's dog's name?
Paloma