The domain is all values of an independent variable(horizontal line) and the range is all values of a dependent variable(vertical line).
The domain is the number of incorrect answers, between 0 and 5. Since he loses $20 for each mistake, his prize range could be any multiple of 20 between 0 and 100.
Domain:& {0, 1, 2, 3, 4, 5}
Range:& {0, 20, 40, 60, 80, 100}
