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I see that you've uploaded a photo of a webpage showing several math problems. Let's go through the questions visible in the image and solve them one by one.

### Problem 1 (visible):
**What percent of 5,280 ft is 440 yd?**

First, we need to convert the yards to feet, since the units should be consistent.

\[
1 \text{ yard} = 3 \text{ feet}, \quad 440 \text{ yards} = 440 \times 3 = 1,320 \text{ feet}
\]

Now, to find the percentage, we use the formula:

\[
\text{Percent} = \left(\frac{\text{Part}}{\text{Whole}}\right) \times 100 = \left(\frac{1,320}{5,280}\right) \times 100
\]

Let's calculate this:

\[
\frac{1,320}{5,280} \times 100 = 25\%
\]

So, **25%** of 5,280 ft is 440 yd.

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### Problem 2 (visible):
**Air flows through a duct at 2,100 cubic feet per minute (CFM). After several feet and a few vents, the air-flow decreases to 1,680 CFM. What is the percent drop that has occurred?**

The formula for percent drop is:

\[
\text{Percent Drop} = \left(\frac{\text{Original} - \text{New}}{\text{Original}}\right) \times 100
\]

Substitute the given values:

\[
\text{Percent Drop} = \left(\frac{2,100 - 1,680}{2,100}\right) \times 100 = \left(\frac{420}{2,100}\right) \times 100
\]

Now, let's calculate it:

\[
\frac{420}{2,100} \times 100 = 20\%
\]

So, the percent drop is **20%**.

---

Would you like a detailed explanation for either solution or assistance with any other questions? Here are five follow-up questions that could expand on this information:

1. How would you convert other units like miles to feet or inches to yards?
2. What would be the percentage change if the airflow dropped to 1,500 CFM?
3. If the original airflow was 2,500 CFM, and it dropped by 600 CFM, what would the percent drop be?
4. How can the concept of percent change be applied to finance, such as stock price fluctuations?
5. How does understanding unit conversions help in real-life situations like construction?

**Tip**: When dealing with percentage problems, always ensure the units of the values are consistent before applying any formulas.

What percent of 5,280 ft is 440 yd? | Air flows through a duct at 2,100 cubic feet per minute (CFM). After several feet and a few vents, the air-flow decreases to 1,680 CFM. What is the percent drop that has occurred?

Learn how to calculate the percentage of feet in yards and the percent drop in airflow using standard mathematical formulas. This guide includes step-by-step solutions and is suitable for students in Grades 6-8.

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