Final answer:
Using Mr. Murray's distance equation M(t) = 3.5t + 2, after 3 seconds (t=3), Mr. Murray is 12.5 meters away from his classroom.
Step-by-step explanation:
To determine how far Mr. Murray is from his classroom after 3 seconds, we use the equation M(t) = 3.5t + 2, where M(t) represents the distance in meters and t is the time in seconds. To find the distance after 3 seconds, we substitute t with 3:
M(3) = 3.5(3) + 2
M(3) = 10.5 + 2
M(3) = 12.5 meters
Therefore, after 3 seconds, Mr. Murray is 12.5 meters away from his classroom.