A thermometer reading 72*F is placed in a refrigerator where the temperature is a constant 38*F. a) If the thermometer reads 60*F after 2 minutes, what will it read after 7 minutes?
b) How long will it take before the thermometer reads 39*F?

A) 42

B)7 1/2 minutes

Step-by-step explanation:

Well if you take 72 and subtract it by 60 you get 12. Then you take that 12 and divide it by 2 you get 6. Next you take 6 and multiply it by 7 and you get you answer which is 42.

So at this point you know that 7 minutes takes it down to 42 degrees. So 42 minus 3 and you get 39. 3 is half of 6. It goes down 6 degrees every minute so half of a minute would be 3 degrees.

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step-by-step explanation: