The function f models the intensity of an X-ray beam, in number of particles in the X-ray beam, t millimeters below the surface of a sample of iron. According to the model, what is the estimated number of particles in the X-ray beam when it is at the surface of the sample of iron? A square B 12 C 5 square D

To find the estimated number of particles in the X-ray beam when it is at the surface of the sample of iron, we need to evaluate the function f at t = 0.<br /><br />Given that the function f models the intensity of an X-ray beam, in number of particles in the X-ray beam, t millimeters below the surface of a sample of iron, we can substitute t = 0 into the function to find the number of particles at the surface.<br /><br />f(0) = 12<br /><br />Therefore, the estimated number of particles in the X-ray beam when it is at the surface of the sample of iron is 12.<br /><br />Answer: B