Chapter 2 - Section 2.1 - Introduction to Integers - Exercise Set - Page 105: 86

The number is -90. The absolute value of number is 90.

Since the opposite of a number $A$ is to put a negative sign in front of the number, if the opposite of number $A=90=-(-90)$, then, by removing the negative sign from it comes out the original number $A =(-90)$. Since the absolute value of a number $A$ is that number's distance from 0 on the number line, if $A=(-90)$, then $|-90|=90$.