To find the cost of each favor \( f \), you know that the base cost of the Carnival party package is $235, and the total cost including the favors for 6 guests is $277.
This means that the total cost is comprised of the base package cost plus the total cost of the favors for the 6 guests. Therefore, you can set up the equation as follows:
\[ 235 + 6f = 277 \]
Now, rearranging for \( 6f \) gives:
\[ 6f = 277 - 235 \]
This simplifies the equation to:
\[ 6f = 42 \]
Now, the correct option among those provided is:
\[ 6f + 235 = 277 \]
So the answer is:
6f + 235 = 277