Tell whether x and y are in a proportional relationship. if so, find the unit rate. Let y be the temperature x hours after midnight. The temperature is 60 degrees Fahrenheit at midnight and decreases 2 degrees Fahrenheit every 1/2 hour.
a. yes, 1 degree Fahrenheit per hour
b. yes, 2 degrees Fahrenheit per hour
c. yes, 4 degrees Fahrenheit per hour
d. no
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