The interval in which the height is always decreasing is:
2.5s < x < 5.5s
In which interval the height is always decreasing?
The function is decreasing if, reading from left to right, the curve goes downwards.
The graph of this problem can be seen below, there, we can see that the rock reaches the maximum height at x = 2.5s, and then it hits the ground at x = 5.5s.
Then the interval in which the height is always decreasing is:
2.5s < x < 5.5s
If you want to learn more about functions, you can read:
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