relate the domain of a function to its graph and, where applicable, to the quantitative relationship it describes [e.g., if the function h(n) gives the number of person-hours it takes to assemble n engines in a factory, then the positive integers would be an appropriate domain for the function]; represent the domain and range using both interval notation (e.g., (2, 10]) and set notation (e.g., {x|2 < x ≤ 10})