Can ya help me with these questions?

What is the equation of the graph below? y=sec(x)-4

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

Which of the functions graphed below has a removable discontinuity?