You know a1.
So find a2, a3, and so on until a7.
a(1) = 12
a(2) = 16
a(3) = 20
a(4) = 24
a(5) = 28
a(6) = 32
a(7) = 36
Each is 4 more than the previous.
Answer:
Step-by-step explanation:

C) 13
The y value adds one by every x; therefore 4 would be 13.
Answer:
The answer is a Variable
Step-by-step explanation:
In algebra, symbols (usually letters) are used to represent numbers. To solve math problems, you should know what variables and constants are. Here is an introduction to the terms variables and constants. A variable is a letter or symbol used as a placeholder for an unknown value.
<u><em>I hope this helps you :)</em></u>