it was 5.2 at midnight....the temp. decreased at a steady rate of 1.1 per hr until 7 a.m.....so it decreased 1.1 degrees every hr for 7 hrs....so it decreased by (1.1 * 7) = 7.7 degrees....so at 7 a.m. it is (5.2 - 7.7) = - 2.5......the temp increased by a total of 4.9 until noon.....so at noon it is going to be (-2.5 + 4.9) = 2.4 degrees F <==
