State the absolute value and the opposite of the number. 31

Absolute value of any positive or negative number is always positive and equal to the magnitude of the number. The absolute value of a number N is denoted by $\left|N\right|$.

For example, the absolute value of 3 is denoted by $\left|3\right|$and is equal to 3.

And the absolute value of $-4$is denoted by $|-4|$and is equal to 4.

Opposite of any real number can be obtained by multiplying it with $-1$. On the number line, opposite of any number be located on the opposite side at the same distance from the midpoint 0.

For example, the opposite of the number $-5$ is 5.

The number 31 is at a distance of 31 units to the right of 0 on the number line.

So, the absolute value of the given number 31 is given by

$\left|31\right|=31$

Thus, the absolute value of the given number is 31.

In order to find the opposite of the number, multiply it with$-1$.

So, the opposite of the given number is

$-1\left(31\right)=-31$

Thus, the opposite of the number is $-31$.