What time does a first quaeter moon rise?

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.

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

Positrons are spontaneously emitted from the nuclei of