Answer:
#6
Domain = {6, 8, 9, 11}
This represents the ages of the students surveyed.
Range = {0, 1, 2, 3}
The range is the possible number of pets that the students may have.
This is not a function because in functions, each x-value can only have one y-value. The x-value, age 11, has two possible y-values, number of pets.
#7
Domain = {1, 2, 3, 4, 5}
This represents the time passed in hours that the distance was measured
Range = {50, 100, 150, 200}
This represents the possible distances in miles that were measured.
This is a function. Each x-value only have one y-value. Each hour only has one possible distance.
Explanation:
The domain is used to state all of the possible x-values in a set of data.
The range is used to state all of the possible y-values in a set of data.
The x-values may also be called independent variables, and the y-values may be called dependent variables. The y-values change depending on what "x" is.
A set of data is a function when each and every x-value only has one y-value.
It is still a function if y-values have more than one x-value. (On a graph, it look like a horizontal line, like in question 7).
