Question: Which of these are equal to 3? Select all that apply.
$-\frac{15}{5}$
$-15/5$
$-15/-5$
1. **State the problem:** We need to determine which of the expressions $-\frac{15}{5}$, $-15/5$, and $-15/-5$ are equal to 3.
2. **Recall the division and negative sign rules:**
- Dividing two numbers: $\frac{a}{b}$ means $a$ divided by $b$.
- A negative sign in front of a fraction means the entire fraction is negated.
- Dividing two negative numbers results in a positive number.
3. **Evaluate each expression:**
- Expression 1: $-\frac{15}{5}$
$$-\frac{15}{5} = -3$$
- Expression 2: $-15/5$
This is the same as $-\frac{15}{5}$, so:
$$-15/5 = -3$$
- Expression 3: $-15/-5$
Dividing two negatives:
$$-15/-5 = \frac{15}{5} = 3$$
4. **Conclusion:** Only the third expression $-15/-5$ equals 3.
**Final answer:**
Only $-15/-5$ is equal to 3.