The temperature measured by a weather station in a certain place at four different times of a day is as follows: 3 ℃ below zero at 6:00 a.m., 1 ℃ above zero at 12:00 noon, 0 ℃ at 4:00 p.m., and 9 ℃ below zero at 12:00 p.m. (1) the temperature at these four different times is expressed by positive or negative numbers. (2) how much higher is 6:00 a.m. than 12:00 p.m. (3) how much lower is 4:00 p.m. than 12:00 p.m

(1) If the temperature above 0 ℃ is positive, then the temperature below 0 ℃ is negative, then 6:00 a.m. - 3 ℃, 12:00 a.m. - 1 ℃, 4:00 p.m., 12:00 p.m. - 9 ℃, (2) 6:00 a.m. is higher than 12:00 p.m. - 3 - (- 9) = 6 ℃, (3) 4:00 p.m. is lower than 12:00 p.m., 1-0 = 1 ℃

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