M represents the month because the value is decreasing every month.
Hope this helps :)
Is that the full question? I can't solve it if s is a variable
Answer:

Step-by-step explanation:
Circumference of a circle is 
The diameter is
inches as shown in the readings of the scale.


Answer:
<u><em>0.14</em></u>
<u><em>Hope this helps :-)</em></u>