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Mrs. Goodwin is planning for a large dinner party, and she is trying to figure out how much food to serve. One of the side dishes is roasted potatoes. Her cookbook recommends serving $f(x)$ ounces of potatoes for $x$ guests.$\newline$What does $f(30) = 150$ tell you?$\newline$Choices:$\newline$(A) Mrs. Goodwin should serve $150$ ounces of potatoes if there are $30$ guests.$\newline$(B) Mrs. Goodwin should serve $30$ ounces of potatoes if there are $150$ guests.