How may ways are there to to sit the committee in a row at a meeting if the freshman, sophomores, and juniors must sit by grade , but the seniors can sit wherever they want?

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

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step-by-step explanatio89