C because the equation goes across on its own without any blockage.
0.4 kilometers each week.
Answer:

Step-by-step explanation:
We have the equation of the position of the object

We need to solve the equation for the variable a

Subtract
and
on both sides of the equality


multiply by 2 on both sides of equality


Divide between
on both sides of the equation

Finally

I’m pretty sure the 2nd one is the associate property and the 3rd one is the additive inverse property
Hope this helps :)
The first one is A and then the next one I believe should be 210 for both