Question

Which of the following can be included in the category of variable?

• A. $12$
• B. $z$
• C. $\frac{17}{5}$
• D. $\pi$

Answer 1

The correct option is B $z$

$12$ is an integer, which has a fixed value. It cannot be used as a variable.
$z$ can be used as a variable.
$\frac{17}{5}$ also has a fixed value, which cannot be used as a variable.
$\pi$ is a constant that has a fixed value close to the value of $\frac{22}{7}$. Hence it cannot be used as a variable.