To complete the equation that models the amount of water, \( w \), that Martina used, we can express the total amount of water she used in relation to the number of containers she filled, which is 5. Since she used 8.5 oz of water in each of these 5 containers, we can represent this as follows:
\[ \frac{w}{5} = 8.5 \]
In this equation:
- \( w \) represents the total amount of water used.
- 5 represents the number of containers.
- 8.5 is the amount of water used in each container.
You can solve for \( w \) by multiplying both sides of the equation by 5:
\[ w = 8.5 \times 5 \]
Calculating that gives:
\[ w = 42.5 \text{ oz} \]
So, the equation that models the amount of water Martina used is:
\[ \frac{w}{5} = 8.5 \]
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