Answer:
a) Domain = 
b) ![x \in [0,100]](https://tex.z-dn.net/?f=x%20%5Cin%20%5B0%2C100%5D)
c) 53.03 worker hours
d) 83.33 worker hours
e) 83.33 worker hours
Step-by-step explanation:
We are given the following in the question:

where W(x) is the number of worker-hours required to distribute new telephone books to x% of the households in a certain rural community.
a) Domain of function.
The domain is the all the possible values of x that the function can take.
Domain = 
b) Values of x
Since x is a percentage in reference to context, it can only take value upto 100. Also it cannot take any negative value.
So domain n reference to context will be
![x \in [0,100]](https://tex.z-dn.net/?f=x%20%5Cin%20%5B0%2C100%5D)
c) worker-hours were required to distribute new telephone books to the first 70% of the households

53.03 worker hours were required to distribute new telephone books to the first 70% of the households.
d) Worker hour for entire community
For entire community, x = 100

83.33 worker hours were required to distribute new telephone books to the entire households.
e) Percentage of the households in the community for 3 worker hours

Thus, 4.74% of the households in the community had received new telephone books by the time 3 worker-hours had been expended.