Algebra-2

Question Analysis
The question tests the student's ability to determine whether a given mapping diagram represents a function. A function requires that each input value (domain) points to exactly one output value (range).

Key Concept Explanation
In a mapping diagram, a function is represented by each input value (element in the domain) pointing to only one output value (element in the range). Multiple inputs can share the same output, but no input can point to more than one output.

Step-by-step Solution
1. List the given inputs and outputs: Inputs {10, 20, 30} point to outputs {5, 5, 5}...