Answer:
2. The airplane will crash into the ground after 5 seconds.
3. The domain of the function is [0,30] and range of the function is
.
Step-by-step explanation:
2.
Ariana initial attempt is modeled by the function,

where, h is the height in feet and x is the time in seconds of the paper airplanes path.
If airplane crash into the ground, then
,




Equate each factor equal to 0.

Therefore the airplane will crash into the ground after 5 seconds.
3.
The height of the rocket in meters is modeled by the function shown below, where t is time in seconds.

The value of t must be positive because time can not be negative.
Find the zeros of the function.


The leading coefficient is negative, so the it is a downward parabola. Since the zeros of the function are 0 and 30, therefore the function is negative before 0 and after 30.
The height can not be negative, so the domain of the function is

The vertex of a downward parabola is the maximum point.
Vertex of a parabola,



Put t=15 it in the equation.


The range of the function is
![[-\infty,900]](https://tex.z-dn.net/?f=%5B-%5Cinfty%2C900%5D)
Therefore the domain of the function is [0,30] and range of the function is
.