Question

A gold mine worker works $30$ feet down. Which of the following integer on the number line best expresses the movement of the worker$?$

• A.
• B.

Answer 1

The correct option is B

• As given in the question, worker works $30$ feet down.
• Therefore, change in worker's position with respect to the ground is given by the integer $-30.$
• So, if the initial ground position of the worker is taken as $0,$ then the change in worker's position can best be represented on the number line as

Therefore, option (b.) is the correct one.