Answer:
1. the set of all real numbers from 0 to 80.
2. {80, 81, 82, 83, ..., 360}
Step-by-step explanation:
So we know based on the number of days the crew works, a certain amount of road will be completed. The amount of road is dependent on the number of days the crew works.
So, number of days crew works = independent variable = D
amount of road completed = dependent variable = L
Since the crew can work for at most 80 days, they can work from 0 to 80 days.
The first answer is the set of all real numbers from 0 to 80.
The length of roads is the function L = 2D + 200. You plug in the D variable as it asks for it. D's domain is from (0, 80).
So,
L = 2(0) + 200 = 200
L = 2(80) + 200 = 360
The answer is {80, 81, 82, 83, ..., 360}
