It is a function.
This is because each x value only has 1 corresponding y value.
It is not linear. The difference between y values from each incrememnt of x is inconsistent. The first 3 increase by 0 but the last one increases by 1.
Answer:

Step-by-step explanation:
Given the expression:

First, we open the outer brackets

Therefore:

Answer:
I think it is 22 but I might be wrong.
Step-by-step explanation:
Answer:
x ≤ −5
Step-by-step explanation: