To find \( n \), the number of cans of food the supermarket has donated after \( w \) weeks, you would use the rule of multiplying by 35.
The relationship can be expressed as:
\[ n = 35 \times w \]
So, if you input \( w \) (the number of weeks), you get \( n \) (the total number of cans donated).
The correct answer is:
A. multiply by 35