Algebra-2

Question Analysis
The question tests the understanding of the definition of a function in the context of a mapping diagram. A function requires that each input value (x-value) corresponds to exactly one output value (y-value). In this case, the input value 7 points to two different output values (21 and 35), which violates the definition of a function.

Key Concept Explanation
A function is a special type of relation where each element in the domain (input values) corresponds to exactly one element in the range (output values). This means that for any given x-value, there should be only one corresponding y-value.

Step-by-step Solution
1. List the inputs and outputs: Inputs {7, 9, 11}, Outputs {21, 27, 35}
2. Check for duplicate input values: The input value 7 ap...