Mr. montgomery's class, there are 8 boys and 12 girls. if mr. montgomery selects 1 student from his class at random, what is the probability that the student will be a girl?

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.