In a relative frequency distribution, what should the relative frequencies add up to? select the correct choice and, if necessary, fill in the answer box to complete your choice. a. the relative frequencies add up to nothing. b. the relative frequencies add up to the total number of observations.

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Describe uniform velocity and variable velocity in short