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These go together. Now follow these directions: • Your formula in A9 should correctly calculate the Number of People required based on the measurements entered in the Input cells. If I change the numbers in the Input cells change, the output must also change! • Your formula in B9 should correctly calculate the what percentage of the available population will be needed based on the measurements entered in the Input cells. If I change the numbers in the Input cells change, the output must also change! • Your formula in C9 should say “YES” or ”NO” depending on if your available population is large enough to span this length, hand-in-hand. To do this you will use the =IF() function! See if you can figure out how it works!

Based on the directions and the content from your project document, I'll guide you on creating the formulas for cells A9, B9, and C9 in your Excel sheet.

### Cell A9: Number of People Required
To calculate the number of people required to span a certain distance hand-in-hand, use the formula:

\[
\text{Number of People} = \frac{\text{Length of Line (in inches)}}{\text{Palm-to-Palm Length (in inches)}}
\]

In Excel, you would:
1. Assume the palm-to-palm length is in cell A4.
2. The line length (converted to inches) is in cell B4.

Formula for A9:
```excel
= (B4 * 5280 * 12) / A4
```
Explanation:
- Multiply the length in miles (B4) by 5280 (feet per mile) and then by 12 (inches per foot) to convert it to inches.
- Divide by the palm-to-palm length in inches (A4).

### Cell B9: Percentage of Population Required
To calculate what percentage of the available population will be needed, use:

\[
\text{Percentage of Population} = \left( \frac{\text{Number of People}}{\text{Available Population}} \right) \times 100
\]

In Excel:
1. The available population is in cell C4.

Formula for B9:
```excel
= (A9 / C4) * 100
```
Explanation:
- Divide the number of people required (calculated in A9) by the total available population (C4) and multiply by 100 to get the percentage.

### Cell C9: "YES" or "NO" Based on Available Population
For cell C9, you want to return "YES" if the available population is large enough to meet the requirement and "NO" if it's not. This can be done with an `IF` function:

Formula for C9:
```excel
= IF(C4 >= A9, "YES", "NO")
```
Explanation:
- If the available population (C4) is greater than or equal to the required number of people (A9), return "YES." Otherwise, return "NO."

### Summary:
1. **A9:** Formula to calculate the number of people required:
   ```excel
   = (B4 * 5280 * 12) / A4
   ```
2. **B9:** Formula to calculate the percentage of the population needed:
   ```excel
   = (A9 / C4) * 100
   ```
3. **C9:** Formula to check if the population is enough:
   ```excel
   = IF(C4 >= A9, "YES", "NO")
   ```

Let me know if you'd like further clarifications!

### 5 Related Questions:
1. How do you convert measurements from feet or miles to inches in Excel formulas?
2. How would you adjust the formula if the line length is given in feet instead of miles?
3. Can you use the same formula for a different country's population and length?
4. How would you modify the formulas if the palm-to-palm length varies for different groups?
5. How could you calculate the total distance covered if more people than required are available?

### Tip:
Always double-check unit conversions when working with formulas that involve different measurement units like miles, feet, and inches.

Your formula in A9 should correctly calculate the Number of People required based on the measurements entered in the Input cells. If I change the numbers in the Input cells change, the output must also change! Your formula in B9 should correctly calculate what percentage of the available population will be needed based on the measurements entered in the Input cells. If I change the numbers in the Input cells change, the output must also change! Your formula in C9 should say “YES” or “NO” depending on if your available population is large enough to span this length, hand-in-hand. To do this you will use the =IF() function!

Learn how to use Excel formulas to calculate the number of people required to span a certain length, the percentage of population needed, and whether the available population is sufficient using IF conditions. Understand key concepts like unit conversion and percentages for Grades 6-9.

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