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Area under a curve

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Please see attached file.

I need to determine the area under each of the curves in red --- I have fitted a curve using Excel to derive the polynomial equation.

In the first graph, the x-axis limits are 0 and 4.5; in the 2nd curve, the x-limits are 0 and 5.0.

The units for the x-axis is time (minutes) and the y-axis is pounds of steam.

Please help me understand how to use the polynomial and limits to obtain the area under the curve. Please explain in simple terms so that I may understand best.

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This provides an example of determining area under a curve. The areas under the curve are determined.

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