3 is the remainder because the closest is 7 times 21 so it’s remainder 3
Answer:

Step-by-step explanation:
Given


Required
How fast is the ball seem to be moving?
This question illustrates relative velocity;
Since the ball and the train moves in the same direction, the required velocity relative to the person standing behind is:

i.e. we add both velocities


Answer:
A. The graph is a line that goes through the points (9,0) and (0,6).
Step-by-step explanation:
Given

Required
Select the true options

This implies that"


So, we have: 


So, we have: 

<em>Hence (a) is true.</em>