Fot an experiment, a liquid is kept in cold storage at a temperature of 20 degrees Fahrenheit(°F). The liquid is removed from cold storage and is warmed at a constant rate of 3°F per hour. Which of the following represents the temperature of the liquid, in degrees Celsius(°C), t hours after it has been removed from cold storage ?

(Note:°C=5/9(°F-32).)

A)5/3t-20/3

B)5/3t-188/9

C)5/9t-20/3

D)27/5t+68

E)3t+20

Solveit Jan 3, 2016

#4**+5 **

The sample STARTS at 20 degrees so the temperature is 20 + ?

Every hour it warms up an ADDITIONAL 3 degrees so the temperature after 't' hours will be INCREASED 3 x t

It STARTED at 20 degrees so add both of the terms together to get the temperature of the sample 20 + (3 x t)

or 20 + 3t Rewritten : 3t + 20

Now I re-read the question: it asks for Celcius

Convert to Celcius 5/9 (3t +20) -32 )

15/9t - 60/9

5/3t - 20/3

So YOU were RIGHT ! I was WRONG....sorry....I misread the question!!!

Guest Jan 3, 2016

edited by
Guest
Jan 3, 2016