can any 1 help me get tru this single problem ...please

any help will be greatly accepted

A thermometer reading 11°C is brought into a room with a constant temperature of 20°C. If the thermometer

reads 18°C after 3 minutes, what will it read after being in the room for 5 minutes? Assume the cooling follows

Newton's Law of Cooling:

U = T + (U0 - T)e^kt.