Answer:
2.5 Degrees Fahrenheit
Explanation:
T=56 + 5h is the expression used to show the temperature in a room after a certain amount of hours with the heater turned on.
h represents the number of hours the heater has been running
56 degrees is the starting temperature before using the heater. We can ignore that for the moment. 5h is the rate of change that we are looking for
5(1 hour) = 5* increase
30 minutes is half of an hour so the equation would be
5(.5) = 2.5* increase
Hope this makes sense and helps : )