Function f gives the temperature, in degrees Celsius, 7 hours after midnight.
Use function notation to write an equation or expression for each statement.
a. The temperature at 12 p.m.
b. The temperature was the same at 9 a.m. and at 4 p.m.
c. It was warmer at 9 a.m. than at 6 a.m.
d. Some time after midnight, the temperature was 24 degrees Celsius.