Question 345529: For a certain hot-water heater, the increase in heating expenses is directly proportional to increase in water-temperature setting. If heating expenses increase by $24 when the water-temperature setting is increased by 20 degrees Fahrenheit, by how much will heating expenses increase when the water-temperature setting is increased by 15 degrees Fahrenheit?
A. $16 B. $18 C. $19 D. $20 E. $21
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! For a certain hot-water heater, the increase in heating expenses is directly proportional to increase in water-temperature setting.
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E = kt
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If heating expenses increase by $24 when the water-temperature setting is increased by 20 degrees Fahrenheit,
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Find "k":
24 = k*20
k = 6/5
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Equation:
E = (6/5)t
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by how much will heating expenses increase when the water-temperature setting is increased by 15 degrees Fahrenheit?
E(15) = (6/5)15
E = 18
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Cheers,
Stan H.
A. $16 B. $18 C. $19 D. $20 E. $21
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