Will someone see if im right? q. whatis the circumcenter of any given triangle?

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

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?