Answer:
Option C. 0≤x≤25
Step-by-step explanation:
we know that
The function f(x) of the graph is a vertical parabola open down
If the function is at least 300
then
![f(x)\geq 300](https://tex.z-dn.net/?f=f%28x%29%5Cgeq%20300)
The solution is the shaded area above the solid line f(x)=300
In the graph plot f(x)=300 and find the value of x
The values of x are
![x=0, x=25](https://tex.z-dn.net/?f=x%3D0%2C%20x%3D25)
see the attached figure
therefore
The interval is ------> [0,25]
All real numbers greater than or equal to zero and less than or equal to 25