Can you help me with this one to? please hurry and make sure its right, I have no attempts left after this and I can fail bc I'm in a catch up class

Last saturday, the museum box office sold 281 tickets for a total of $3,954. adults ticket cost $15, and students ticket cost $12. how many of each kind of tickets were sold?

What is the volume of a rectangular prism that is 120 centimeters by 2 meters by 1.5 meters in cubic meters?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?