What are the four most common gases in dry air?

Which changes of state do the labels represent? a: b: c:

At time t=0, a particle is located at the point (3,6,9). it travels in a straight line to the point (5,2,7), has speed 8 at (3,6,9) and constant acceleration 2i−4j−2k. find an equation for the position vector of the particle.

What is the measurement of how fast an object moves relative to a reference point?