I believe it is the third option
For this case we have that by definition, a linear function is of the form 
If we have that a and b are linear functions, then they are of the form:
If we multiply them we have: (Applying distributive property)
That is, we get a quadratic function.
Answer:
Answer:
When the car is stopped at the traffic light, the dashboard (which is part of the car) and the book are both at rest. As the car accelerates forward, the dashboard moves forward. But no force is exerted directly on the book, so it remains at rest. Because of its inertia, the book does not move forward when the dashboard moves forward. From the reference point of the car, the book appears to move backward, sliding off the dashboard.
I believe it is pleaing i hope this is correct and helps
