Station #6 chemiluminescense

If you want to change the pitch of a sound, you have to change the

Which is not true about oxygen-17 and oxygen-18?

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.