I solved the following question:

Question

"A ball is launched from the top of a 320 m high building at 50 m/s at an
angle of 37 degrees to the horizontal. For the first 10 seconds of flight,
make a table of the vertical position from the ground versus time similar
to the one below using Excel. Use excel to graph the vertical position on the vertical axis and time on the horizontal axis for this 10 second time interval. Add a trend line and i ts equation. What does the equation say about the acceleration of the object?"

How do I find the formula for the trend line and what does it say about acceleration.