$5.40 is the cost of 20 oz of milk.
A function in mathematics from a set X to a set Y allocates exactly one element of Y to each element of X. The sets X and Y are collectively referred to as the function's domain and codomain, respectively. Initially, functions represented the idealized relationship between two changing quantities.
Given
C = 0.25w + 0.40
w = 20
C = 0.25*20 + 0.40.
C = 5.40
Therefore, $5.40 is the cost of 20 oz of milk.
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