Annual Income ($)
A researcher studies 100 men between the ages of 45 and 55.
He makes a graph of their annual income as a function of the
highest grade in school that they completed. The data model a
linear function.
500,000
50,000
0
4 8 12 16 20'
Highest Grade Completed
What is the domain for this function, as shown in the graph?
O positive numbers from 0 to 500,000
O positive integers from 45 to 55
O all positive numbers
O positive integers from 0 to 20