The cost to mail a letter with the United States Postal Service is calculated by the weight of the letter in ounces and is given by
the equation c = 0.21(x - 1) +0.50. What does the value 0.50 most likely represent?
The cost, in dollars, to mail a one ounce letter
The cost, in dollars, to mail an additional ounce.
The average weight, in ounces, of a letter.
The total weight, in ounces, of a letter