Question: 4. A patient receives one full box of Humalog insulin pens. Each box contains 15 mL and the concentration is 100 units per mL. What is the total number of units in the full box?
1. **State the problem:** We need to find the total number of insulin units in a full box that contains 15 mL of Humalog insulin, with a concentration of 100 units per mL.
2. **Formula used:** Total units = Volume (mL) \times Concentration (units/mL)
3. **Apply the values:**
$$\text{Total units} = 15 \text{ mL} \times 100 \text{ units/mL}$$
4. **Calculate:**
$$\text{Total units} = 1500 \text{ units}$$
5. **Explanation:** Since each milliliter contains 100 units, multiplying by 15 mL gives the total units in the box.
**Final answer:** The full box contains 1500 units of Humalog insulin.