How do I make a function out of this to answer #1?

A fireworks projectile is launched at 20 meters per second from a 60-meter cliff. The table shows the height, y, in meters the projectile is above a field after x seconds. Use the table for Problems 3-9. Time (seconds) 1 4 5 Height (meters) 60 75 80 75 60 35 1. Make a scatter plot of the data. 3. Over what interval is the projectile's height Function: increasing ? (01 2) 100 Ty 4. Over what interval is the projectile's height decreasing? (2, 5) 80 Height (m) 60 40 5. What is the domain and range of the model? 20 Domain (0, 5) Range ( 35, 80) 0 4 6 8 10 Time (sec) 2. What is the maximum height of the projectile? _max = 80