ANSWER:
The rocktet was in the air approximately 6 seconds before hitting the ground.
Explanation:
What we will do to solve the question is analyze statement by statement in order to check its veracity:
1. The rocket was launched from a height of 180 feet.
We can know that the rocket was launching from 180 feet high because that is its value at time 0, therefore the statement is correct.
2. The maximum height of rocket occured 3 seconds after launch.
If we look closely, the maximum height is 324 feet and it happened at 3 seconds, therefore this statement is correct.
3. The rocktet was in the air approximately 6 seconds before hitting the ground.
For the rocket to be on the ground, the height must be 0 feet. At no time is the height 0, therefore this statement is incorrect.
4. The rocket was above 300 feet for approximately 2 seconds.
The rocket at two seconds had a height of 308 feet, therefore if it is close to 300 feet making this statement correct
Which means that the invalid statement is: The rocktet was in the air approximately 6 seconds before hitting the ground."