22. A TV repairman charges $45 to make a house call, plus $30 an hour for labor.
Let C represent the total cost of a visit for h hours.
Write an equation to determine the total cost of a visit for h hours.
What is the independent variable?
What is the dependent variable?
What are the constants (numbers that don't change)? 30, 49
Use the domain {0, 1, 2, 3} to determine the range:
Is this a function?