7 The amount of water in tons used per hour in a factory is shown in the table Factory Water Usage Thao hours Water tone 0 1 1 14 1 28 1 45 1 68 1 90 2 17 2 45 2 3 1 4 5 6 7 If the water usage per hour continues to increase exponentially what is the best estimate for the amount of water that will be used in the tem hour 3 6 tons B 4 1 tons c 3 2 tons