Acompany is inspecting several industrial refrigerators for how quickly
they lower temperatures. a sample of material is placed in each
refrigerator, with the sample's start temperature s and final temperature f
shown on the number lines. all times were recorded in the morning.
refrigerator
start
time
end
time
number line
s
refrigerator a
8: 00
8: 15
-10
-5
0
5
10
15
20
25 30
35
40 45
50 55 °c
refrigerator b
9: 00
9: 20
-10 -5
0
5
10
15
20
25 30
35 40 45
50 55 °c
s
refrigerator c
8: 30
9: 15
-10
-5
0
5
10
15
20 25 30
35
40
45
50 55 °c
refrigerator d
9: 15
9: 25
-10
-5
0
5
10
15
20 25
30
35
40
45 50 55 °c