Commonly the horizontal axis represent the x-axis. So, you need the point that means x = 3 (positive 3), so, it is the point A.
The rate is 1km/15min
It's a fraction where the denominator is 15 minutes.
To make it a unit rate, we need to make the denominator 1.
A unit rate would be 4 km / hour.
Answer:

Step-by-step explanation:
Let
be that number.





21 is the number.
You have the comma in the wrong place.
It's 4,000,000 NOT 4000,000.
Round[4,000,000, 10]
Answer: 4 million