Answer:
-12° C
Step-by-step explanation:
Temperature at 8 a.m.: -3° C
From 8 a.m. to 1 p.m. the temperature went up 5° C.
-3° C + 5° C = 2° C
Temperature at 1 p.m.: 2° C
By 6 p.m. the temperature was 2° C colder than at 1 p.m.
2° C - 2° C = 0° C
Temperature at 1 p.m.: 0° C
The temperature decreased 3° C per hour from 6 p.m. to 10 p.m.
From 6 p.m. to 10 p.m., it's 4 hours. The temperature decreased 3° C per hour for 4 hours. 4 * 3° C = 12° C. The temperature went down 12° C altogether from 6 p.m. to 10 p.m.
0° C - 12° C = -12° C
Temperature at 10 p.m.: -12° C
Answer: -12° C
