Please help me i need help

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

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 one ? is the answer and how to find this answer