If a graph was drawn to show the speed of a car, what would the slope look like as a car is sitting at a red light?

positive

negative

zero

undefined

Question

If a graph was drawn to show the speed of a car, what would the slope look like as a car is sitting at a red light? 

 positive 

 negative 

 zero 

 undefined

anonymous · Answer

if you are sitting at a red light, then presumably you are not moving. slope would be zero

anonymous · Answer

actually that is a rather bad explanation.  the reason the slope is zero is because you are at a constant speed, not because your speed i zero. 
the slope would also be zero if you had the cruise control set at 65 mph and went at exactly that rate for a while