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The function $\displaystyle {D}{\left({p}\right)}$ gives the number of items that will be demanded when the price is $\displaystyle {p}$ . The production cost, $\displaystyle {C}{\left({x}\right)}$ is the cost of producing $\displaystyle {x}$ items. To determine the cost of production when the price is $\displaystyle \${6}$ , you would:

Solve $\displaystyle {C}{\left({D}{\left({p}\right)}\right)}={6}$
Evaluate $\displaystyle {C}{\left({D}{\left({6}\right)}\right)}$
Solve $\displaystyle {D}{\left({C}{\left({x}\right)}\right)}={6}$
Evaluate $\displaystyle {D}{\left({C}{\left({6}\right)}\right)}$

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