Week 4: Functions – Day 3

Function values can increase, decrease, stay the same or neither. Sometimes the behavior differs depending on the domain. For each function below state whether it is increasing, decreasing, or staying the same on the specified domain. (Hint: the functions below do not wiggle around a lot. In the specified domain they are either increasing, decreasing or staying the same).

1. f(x) = 5x – 6 domain: all x

2. f(x) = 19 domain: all x

3. f(x) = -3x + 75 domain: all x

4. f(x) = x2 domain: x is > 0.

5. f(x) = 1/x domain: x is not equal to 0.

Answers