Answer:
The answer is B) 0.57.
Step-by-step explanation:
In this problem we have to apply queueing theory.
It is a single server queueing problem.
The arrival rate is
and the service rate is
.
The proportion of time that the server is busy is now as the "server utilization"and can be calculated as:

where c is the number of server (in this case, one server).
Answer:
You're answer to your question is the letter B.
Answer:
D) See that the red and purple triangles can be subtracted from both pictures
Step-by-step explanation:
I just did answered this question on USATestprep
D. 4x +7y
3x+5y+x-2y
x is also another way to say that there is 1x
4x + x (or 1x)= 5x
3y and 7y have the same variable
7y+3y=10y
Hence number D