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The Bedrock water department has a monthly service charge of $12.30 and a volume charge of $1.70 for every 100 cubic feet of water. Which of the following equations can be used to determine the Sandstone family's monthly water bill? (Let x represent 100 cubic feet of water and y represent the monthly cost.)

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egrigg2010

Answer: The equation 1.70x + 12.30y = c could be an expression that represents this situation because the expression above states that $1.70 for every 100 cubic feet of water plus the service charge of $12.30 per month will equal the total cost, c.

y = 1.7x + 12.30

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