A community garden is being planned in the town-owned field behind the housing development where you live. The rectangular garden will border the development and extend into the field. Each household that joins the project will have a rectangular plot that is 20 feet wide. The town has already permitted the plots to extend 10 feet into the field, and promised another foot for every household that reserves a plot. a. Write an equation that gives the area A (in square feet) of the community garden as a function of the number x of households that reserve a plot.