Question

Which of the following is an example of a variable?
A.3
B. sq root of 12
C. 5 sq.
D.y

Answer 1

do you know what is a variable??

Answer 2

A symbol for a number we don't know yet. It is usually a letter like x or y

Answer 3

Any numbers are not variables!
So the letter "y" is a variable because any number can be substituted for "y". Variables are letters which hold the place of a number