write a function that represent the cost of x gallonas of paint number of gallons sold cost 1gallon= 25$ 2gallons= 48$ 4gallons= 94$ 9gallons= 209$ 12gallons= 278$

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A power function that works is Cost = 24.720536*X^0.9709509.  Since the exponent is so close to 1.0, this is almost a straight line with a slope of 24.72.