What is 3,700,000,000 in scientific notation

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?

5x−4≥12 or 12x+5≤−4 can you with this problem

I’m still confused on how to work the percentages