Ashop owner bought 30 folders and some journals. he paid $82.50 for the folders. each journal cost 10 times as much as a folder. what was the cost of each journal?

What is the frequency of the sinusoidal graph?

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.

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =