3 gallons of milk cost $$ \$ 9.87 $$. What is the unit rate? $$ \$ \sqrt{3.29} \text { per gallon of milk } $$

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To determine the **unit rate**—the cost per single gallon of milk—you should divide the **total cost** by the **number of gallons** purchased. Here's how to do it step-by-step:

### Given:
- **Total Cost**: \$9.87
- **Total Gallons**: 3 gallons

### Calculation:
$$ \text{Unit Rate} = \frac{\text{Total Cost}}{\text{Total Gallons}} $$

Plugging in the numbers:
$$ \text{Unit Rate} = \frac{\$9.87}{3 \text{ gallons}} = \$3.29 \text{ per gallon} $$

### Explanation of the Mistake:
The expression $$ \$ \sqrt{3.29} $$ suggests taking the square root of 3.29, which is not the correct approach for finding a unit rate in this context. The square root operation is unrelated to calculating unit prices.

### **Correct Unit Rate:**
$$ \$3.29 \text{ per gallon of milk} $$

So, **each gallon of milk costs \$3.29**.
Each gallon of milk costs \$3.29.

3 gallons of milk cost \( \$ 9.87 \). What is the unit rate? \[ \$ \sqrt{3.29} \text { per gallon of milk } \]

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