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To write $15.89 : 3 \text{ ft}$ as a unit rate, we need to divide $15.89 by 3 to find the cost per foot.

\[
\text{Cost per foot} = \frac{15.89}{3} = 5.30
\]

Thus, the unit rate is $1 \text{ ft} : 5.30 \text{ dollars}$.

The correct answer is **1 ft : $5.30**.

Do you want more details or have any questions?

Here are some related questions:
1. How do you find a unit rate in general?
2. What are common real-life examples where unit rates are used?
3. How can you check if a unit rate is correct?
4. What are the steps for converting different types of rates?
5. Can unit rates involve units other than currency?

**Tip**: Always double-check the division when finding unit rates, as it's easy to make simple calculation errors.

Learn how to convert $15.89 for 3 feet into a unit rate with a step-by-step solution. This problem focuses on calculating unit rates using division. Suitable for middle school students in Grades 6-8.

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