Oi
Just calculating the differential. Step by step:

If you want to know where the tangent has no slope:
Answer:
6
Step-by-step explanation:
6 divided by 2 is 3
I think N? Because it’s took 100 kilo and The other it took less
Answer:
The one shown in the photo
Step-by-step explanation:
A proportional relationship is one in which the relationship increases steadily, which looks like a straight line when graphed. Also, the line should pass through the <em>origin</em>, which is the point (0, 0) on a graph.
The graph shown increases steadily (it's a straight line), and passes through the origin (point 0,0) as well. So, it's proportional. Hopefully that's helpful! :)