To interpret the height of the school's roof based on the given equation \(y = -16t^2 + 40\), we can analyze the equation:
In the equation:
- \(y\) represents the height (in feet),
- \(t\) represents the time (in seconds),
- and the constant term, \(40\), indicates the maximum height from which the egg is dropped.
When the time \(t = 0\), the height \(y\) is:
\[ y = -16(0)^2 + 40 = 40 \text{ feet} \]
Therefore, the height of the school's roof can be correctly interpreted as 40 feet.
So, the correct response is:
40 feet.