Composition of Functions · Exercise 95

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

ⓐEvaluate $D\left(C\left(6\right)\right).$
ⓑEvaluate $C\left(D\left(6\right)\right).$
ⓒSolve $D\left(C\left(x\right)\right)=6.$
ⓓSolve $C\left(D\left(p\right)\right)=6.$

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Algebra and Trigonometry 2e · §3.4 Composition of Functions · Exercise 95