A group of students carried out an investigation into the rate at which different foods cool down. They measured the temperature of each food at 30 second intervals until the food had cooled from 80oC to room temperature. They then drew graphs of the results. In each case, the graph was the same shape. Which of the following describes the shape of their graphs?

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A group of students carried out an investigation into the rate at which different foods cool down. They measured the temperature of each food at 30 second intervals until the food had cooled from 80<sup>o</sup>C to room temperature. They then drew graphs of the results. In each case, the graph was the same shape. Which of the following describes the shape of their graphs?





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