$\"\"$

The function is $\"\"$ .

Where H is the height of the fire work shell and t is time in seconds.

The speed of the fire work shell is $\"\"$ . \ \

Find the value of t, since t is time in seconds.

So $\"\"$ .

To find the height of the fire work after 3 seconds the value of $\"\"$ substitute in $\"\"$ .

$\"\"$

$\"\"$ .

Since H in feet, the high will the fire work after 3 seconds is 238 feet. $\"\"$

Find the value of t, since t is time in seconds.

So $\"\"$ .

To find the height of the fire work after 5 seconds the value of $\"\"$ substitute in $\"\"$ .

$\"\"$

$\"\"$ .

Since H in feet, the high will the fire work after 5 seconds is 346 feet. $\"\"$

The high will the fire work after 3 seconds is 238 feet and high will the fire work after 5 seconds is 346 feet.