The Formula C = 20W shows how much the cost, C, of sending a letter by first-class mail depends on The Formula C = 20W shows how much the cost, C, of sending a letter by first-class mail depends on the weight of the letter, W. (C is measured in cents and W is measured in ounces). So you consider C a function of W and write C(W) = 20W. What is the domain of C?

The domain of C = All positive real numbers

The given relationship is:

C  =  20W

where:

W represents the weight of the letter in ounces

C represents the cost of sending the letter in cents

The domain of a function is a set of all the input values.

In the function C = 20W, the weights (W) represent the input values.

Since the weight of a letter cannot be negative, it can only contain positive real numbers (Both integers and decimals)

Therefore, the domain of C is a set of all positive real numbers

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answer: your answer is c

step-by-step explanation: