A rectangular plot of ground is to be enclosed by a fence and then divided down the middle by another fence. The fence down the middle costs Php 40 per running foot and the other fence costs Php 50, and Php 30000 worth of fencing materials is to be used. Let x feet be the length of the fence down the middle. Express the number of square feet in the area of the plot as a function of x.

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Q: what is the slope formula?

A:

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