Suppose the cost of producing copper tubing is $1 per foot. If production costs were measured on the vertical axis and quantity of copper tubing were measured on the horizontal axis, which of the following lines would have the smallest slope?
a. a line representing the quantity of tubing measured in inches
b. a line representing the quantity of tubing measured in feet
c. a line representing the quantity of tubing measured in yards
d. the 45-degree line
e. any vertical line
A
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