Courtney is standing on a mountain above a lake, and she tosses a rock with a velocity of 48 ft/sec. Here is a table of values that represents the height of the rock, in feet.

Question

Time (seconds) Height (feet)
0 140
1 160
2 140
3 90
4 10
This is a
function.

The maximum height of the rock is
feet.

The rock changes direction after
seconds in the air.

Answer 1

This is a function because each input (time) corresponds to exactly one output (height).

The maximum height of the rock is 160 feet.

The rock changes direction after 2 seconds in the air.