17. The three symbols x, Vy, and a have eight possible combinations of signs. For example, one combination is (x, Vx, ax) = (+,-, +).
a. List all eight combinations of signs for x, Vx, az.

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.