Write the function rule

The cost to manufacture x pairs of sunglasses can be represented by a function, C(x).  If it costs $398 to
manufacture 4 pairs of sunglasses, which of the following is true?  
Select the correct equation.
A.)  C(4) = 99.50
B.)  C(398) = 4
C.)  C(4) = 398
D.)  C(99.50) = 1

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The cost, C, is dependent upon the number of sunglasses made, x.

Number of sunglasses, x, is the input, while cost, C, is the output.

C.)  C(4) = 398 is the correct equation

The cost is $398 to manufacture 4 pairs of sunglasses.

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