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The text indicates that the constant of variation, which is equivalent to the unit rate, is given as 2.9. Since the constant of variation represents the cost per pound, the missing value is:

\[
\boxed{2.9}
\]

Thus, the cost per pound of peanuts is **$2.90**.

Would you like more details or have any questions?

Here are 5 related questions:
1. What is a constant of variation in a direct variation equation?
2. How would the price per pound change if the constant of variation was 3.5 instead of 2.9?
3. Can a constant of variation be negative in some cases?
4. How do we calculate the total cost if we know the price per pound and the number of pounds?
5. In what real-world situations might you encounter a constant of variation?

**Tip:** When solving word problems involving unit rates, the constant of variation often represents a direct relationship between two quantities, such as cost per unit.

The constant of variation is the unit rate. So, the constant of variation is 2.9. This means that the cost per pound of peanuts is $____.

Learn how to find the cost per pound of peanuts using the constant of variation, which is given as 2.9. This problem involves understanding unit rates and direct proportionality, suitable for students in Grades 6-8.

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