Which of the following equations is an example of inverse variation between variables x and y

Answer this question! 30 points and brainliest! only if you know the answer.

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Raymond just got done jumping at super bounce trampoline center. the total cost of his session was $43.25 . he had to pay a $7 entrance fee and $1.25 for every minute he was on the trampoline. write an equation to determine the number of minutes (t) that raymond was on the trampoline.