Assume a statement true and then show it must be false.
This is also called 'proof by contradiction'.
Set up a proportion.
75/125 = x/1300
125*10.4=1300
75*10.4=780
x=780
Final answer: 780 students
The distance between 2 points can be found by using this equation
√(x₁ - x₂)² + (y₁ - y₂)²