Question

look at this mapping diagram:
domain
-20
17
-1
2
16
14
range
-1
10
1
0
11
is this relation a function?
yes
no

Explanation:

Step1: Recall function definition

A relation is a function if every element in the domain maps to exactly one element in the range.

Step2: Check domain elements

Verify each value in the domain: -20, 17, -1, 2, 16, 14 all have only one arrow pointing to a single range value. No domain element maps to more than one range element.

Answer:

yes