The graph represents the height y, in meters, above a lake of a rock x seconds after it is thrown from a ledge. which statements are true? select each correct answer. the rock reaches a maximum height of 38 m. the rock reaches a maximum height of 43 m. the height of the rock is decreasing for 2 s. the rock travels at 4 m/s . the rock is in the air for 4 s.

The rock reaches a maximum height of 43 m:
 For this case, when observing the graph we see that for the time t = 1 the rock reaches its maximum height.
 The maximum height of the rock is 43 meters.

 The rock is in the air for 4 s:
 What you should observe is the domain of the function.
 The domain is the values of the horizontal axis.
 The domain is [0, 4]
 Therefore, the height is 0 when the time is t = 4.