Garrett is creating a table to model the speed of a canoe in a river. He knows that the canoe travels at 4 mph in Stillwater. What does X represent in Garretts table

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fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right

the answer is simply just 6n add the two together as they have an n