Brianna's teacher asks her which of these three expressions are equivalent to each other.
expression a: 9x - 3x - 4
expression b: 12x - 4
expression c: 5x + x - 4
brianna says that all three expressions are equivalent because the value of each one is -4 when x = 0
brianna's thinking is incorrect. yes or no
identify the error in brianna's thinking. determine which of the three expressions are equivalent.

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?

Which table represents a linear function? i'll give brainliest to first answer ^'^

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.