4. (C1) Arizona license plates are designed so there are three letters followed by four
digits. How many different license plates
are possible?
A. 175,760,000
B. 47,174,400
C. 78,524,000
D. 115,316,136

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?