Chapter 7 - Functions and Graphs - 7.2 Domain and Range - 7.2 Exercise Set - Page 458: 25

Domain= (negative infinity, infinity) Range= {4}

This function is a horizontal line going through the y-axis at point 4. The function stretches on indefinitely to the left and to the right. This means our domain is infinite in both directions. Domain=(negative infinity, infinity) The function is a horizontal line. We can not use interval notation because there is only one number. We instead use set builder notations. Range={4}