The environmental effects of a chemical spill in the Clarion River can be estimated from the river’s flow volume. To measure this flow volume, it is necessary to find the cross-sectional area of the river at a point downriver from the spill. The distance across the river is 240 feet, and the table gives depth measurements, D(x), in feet, of the river at various distances x from one bank of the river. Use these measurements with Simpson’s Rule to estimate the cross-sectional area.

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40 80 120 160 200 240 D(x) 22 35 48 32 24