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Grayson is ordering a taxi from an online taxi service. He has to pay a flat charge just
to order the taxi, and then has to pay per mile, depending on how far he travels. He
wrote an equation to represent his total cost, y = 2.9x + 4.5, where y represents
the total cost in dollars and cents, and x represents the number of miles he travels.
What could the number 2.9 represent in the equation?