Chapter A, Problem 1E

To determine

To calculate:

The value of $-3--5$.

Answer to Problem 1E

Solution:

The value of $-3--5$ is $2$.

Explanation of Solution

Approach:

In a scientific calculator, the subtraction button is labeled $\boxed{-}$ and for negative symbol the button $\boxed{+/-}$ is used that changes the sign of a number that is on display.

For a positive number $a$, $a\boxed{+/-}$ on the calculator reads $-a$ and $a\boxed{+/-}\boxed{+/-}$ reads $a$.

Calculation:

Type,

$3\boxed{+/-}\boxed{-}5\boxed{+/-}\boxed{=}$

The display of the scientific calculator will read $2$.

Therefore, the value of $-3--5$ is $2$.

Conclusion:

Hence, the value of $-3--5$ is $2$.