Question

Which of these is the length of the interval $(-12,21)$?

• A. $9$
• B. $-9$
• C. $33$
• D. $-33$

Answer 1

The correct option is C $33$

Length of an interval $(x,y)$ is given by $|y-x|$.
So we get length of interval $(-12,21)$$=|21-(-12)|=33$