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?

A) The cost, in dollars, to mail a one ounce letter
B) The cost, in dollars, to mail an additional ounce.
C) The average weight, in ounces, of a letter.
D) The total weight, in ounces, of a letter.

Which system of linear inequalities is represented by the graph? + l tv x-3y > 6 and y > 2x o x + 3y > 6 and y o x-3y > 6 and y> 2x o x + 3y > 6 and y > 2x + 4 la +

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

Determine if the equation defines y as a function of x: 2xy = 1. yes o no