4. Why is the sell price always higher than the buy price? Write your answer on your study sheet. To answer this, assume the buy is higher and see if you can make a profit by making two exchanges in succession.

Passengers usually start to board their flights 1 hour before the scheduled take off time. the gate will be closed 15 minutes before the takeoff time. jack’s plane is scheduled to take off at 12: 05 a.m. if he arrives at the gate at 11: 45 p.m., can he board the flight?

How do i do this? i don’t understand

Find the cosine function that is represented in the graph.