Answer:
The value of 4 is an input of the function
Step-by-step explanation:
Define the variables
Let
x ----> the independent variable or input value
y ----> the dependent variable or output value
Looking at the graph
The domain of the graph (all possible values of x) is equal to the interval
[1,∞)
![x\geq 1](https://tex.z-dn.net/?f=x%5Cgeq%201)
All real numbers greater than or equal to 1
The range of the function (all possible values of y) is equal to the interval
(-∞,3]
![y\leq 3](https://tex.z-dn.net/?f=y%5Cleq%203)
All real numbers less than or equal to 3
therefore
The value of 4 is an input of the function