How many additional electrons does this atom of oxygen need in its valence shell to satisfy the octet rule?

Porque crees que el agua no podia subir mas de 10 m de altura con ese tipo de bomba

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Could someone me find the answer to this problem.