Determine whether the description corresponds to an observational study or an experiment. research is conducted to determine if there is a relation between lung capacity and proximity to coal mines. does the description correspond to an observational study or an experiment?

Sketch the vector field vector f( vector r ) = 8vector r in the xy-plane. select all that apply. the length of each vector is 8. the lengths of the vectors decrease as you move away from the origin. all the vectors point away from the origin. all the vectors point in the same direction. all the vectors point towards the origin. the lengths of the vectors increase as you move away from the origin.