Anybody help me! Please Please

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

The energy produced as a result of this flow of electrons from atom to atom is called