First multiply 0.5 by 6 since the six hours and every hour is 0.5 degrees less or you can add 0.5 six times. You then take the answer which would be 3 and add 3 to -3.4 resulting in -0.4. Afterwards you would take -0.4 and subtract 5.3 degrees three times. This gives you -16.3 degrees. You would be at 7:00 PM because 10:00 a.m. plus six hours would be 4 o'clock and the next 3 hours would add on to 7.
