How to put it into an interval notation

What is the value of x? enter your answer in the box. photo attached.

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?

Simplify the expression. -2/5(10+15m-20n)