Can anyone help with this question?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

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?

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180