Which statement best explains acceleration? it is the total distance covered over a period of time. it is a change in velocity over a period of time. it is a change in displacement over a period of time. it is a change in direction over a period of time.

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

Carbon 14 is a naturally occurring stable

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.