Which number is ten thousand less than 842,719

Alarge rectangle is divided into four smaller rectangles.

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

What expression is equivalent to log3(x+4)