4/5 because 12/3=4 and 15/3=5
Answer:
C
Step-by-step explanation:
x=60
60
60+30=90
60-30=30
60+90+30=180
Answer:

Step-by-step explanation:
The domain is the span of x-values covered by the graph.
From the graph, we can see that the x-values covered by the graph is all values to the left of zero including zero.
Therefore, the domain is all x-values less than or equal to 0:

Further notes:
In interval notation, this is:
![(-\infty,0]](https://tex.z-dn.net/?f=%28-%5Cinfty%2C0%5D)