6. This graph represents the temperature in an apartment starting at midnight one day.
80
75
y= H(X)
70
temperature (°Fahrenheit)
65
60
55
50
0
2
4
6
8
10
12
14
16
18
20
22
time (hours)
a. Estimate H(18) and explain what it means in this situation.
b. For what values of x does H(x) = 70?
c. For what values of x does H(x) = 55?
d. Identify the interval where F(x) is decreasing, and explain what it means in this
context.