At technology cyber charter school, each of the ninth grade homerooms has the same number of students and one teacher. on the last day of school, each student created a card for each of the other students in their class.
the expression 14s(s-1) can be used to find the total number of cards created by the ninth grade students. based on the given information, which of the following statements must be true? select all that apply.

Aprofessional hockey team has noticed that, over the past several seasons, as the number of wins increases, the total number of hot dogs sold at the concession stands increases. the hockey team concludes that winning makes people crave hot dogs. what is wrong with the hockey team's conclusion? a) it does not take into account the attendance during each season. b) it does not take into account the number of hamburgers sold during each season. c) it does not take into account the number of concession stands in the hockey arena. d) it does not take into account the number of seasons the hockey team has been in existence.