How much is 20-20? help me please

Find the total area for the regular pyramid ( follow the answer set up in the picture)

What is the answer to |-2x-5|-|-4+8| and x=7

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