The linear model represents the height, f(x), of a water balloon thrown off the roof of a building over time, x, measured in seconds: part a: during what interval(s) of the domain is the water balloon's height increasing? (2 points) part b: during what interval(s) of the domain is the water balloon's height staying the same? (2 points) part c: during what interval(s) of the domain is the water balloon's height decreasing the fastest? use complete sentences to support your answer. (3 points) part d: use the constraints of the real-world situation to predict the height of the water balloon at 16 seconds. use complete sentences to support your answer. (3 points)