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Volume of Water in a swimming pool

A rectangular swimming pool is 30 ft wide and 50 ft long. The table below shows the depth h(x) of the water at 5-ft intervals from one end of the pool to the other. Estimate the volume of water in the pool using the Trapezoidal rule with n=10, applied to the integral .

I have to use the trapezoidal rule to solve this, and it all seems confusing, but probably isn't. Any help is appreciated, thanks. The 5 in the integral is suppose to be a 50, but I couldn't get the latex to work right -.-