If the relationships below are given in the form (input, output), which pairing always describes a function? a) (number of doors in a car, number of cup holders in the car) b) (height of a building in feet, height of the building in inches) c) (beverage charge on a bill, total meal charge on the bill) d) (distance from home during a trip, time elapsed during the trip)

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.