In a lab, the temperature of various chemical reactions is changing by a fixed number of degrees per minute. Write a numeric expression that describes each of the following if all times are on the same day.
a. The temperature at 8:00 p.m. is 32˚C. If it drops 3˚C per minute, what will the temperature be at 8:30 p.m.?
b. The temperature at 8:20 p.m. is 0˚C. If it has dropped 4˚C per minute, what was the temperature at 7:55 p.m.?
c. The temperature at 8:00 p.m. is –20˚C. If it has dropped 4˚C per minute, what was the temperature at 7:30 p.m.?
d. The temperature at 8:00 p.m. is 25˚C. If it has been increasing every minute by 3˚C, what was the temperature at 7:40 p.m.?
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