To complete the table using the equation \( f = 8c \), we can calculate the total number of cans of food \( f \) for each given number of cats \( c \).
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For \( c = 3 \): \[ f = 8 \times 3 = 24 \]
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For \( c = 4 \): \[ f = 8 \times 4 = 32 \]
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For \( c = 5 \): Given \( f = 40 \), which matches our equation since: \[ f = 8 \times 5 = 40 \]
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For \( c = 6 \): \[ f = 8 \times 6 = 48 \]
Now we can fill in the table:
\[ \begin{array}{|c|c|} \hline c & f \ \hline 3 & 24 \ 4 & 32 \ 5 & 40 \ 6 & 48 \ \hline \end{array} \]