On December 30 2013 the temp started at 13 degree f .for next 5 hours the temp dropped 2 and1/2 degree per hours then the temp increased 4 degree what is the temp after these changes

Answer 1

Can somebody answers please temp started at 12 degree

Answer 2

12 - (5 * 2.5) + 4 =

12 - 12.5 + 4

12 - 8.5 = 3.5 degrees