### Home > CCA > Chapter 1 > Lesson 1.1.3 > Problem1-29

1-29.

Mr. Guo is thinking of a number. When he takes the absolute value of his number, he gets $15$. What could his number be? Is there more than one possible answer?

Remember that the absolute value of a number is its distance from zero on the number line and it is always positive.
Can more than one number have the same absolute value? How is that possible?

Either $15$ or $−15$. Make sure you understand why.