Answer:
Step-by-step explanation:
**Note: The polynomial in question is -16t² + 160t, as clarified in the discussion under the question.**
Since there is a polynomial to find the height given a certain time, the height is a function of time.
This function would be h(t) = -16t² + 160t, so plugging in 4 for t would give the height.

<em>[Squaring 4]</em>
<em />
<em>[Multiplying]</em>
<em />
<em>[Combining both terms]</em>
Hence, the <u>height</u> of the firework after 4 seconds is 384 feet.