C= 5/9 (f-32)

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

A) (5/3)t – 20/3

B)(5/3)t -188/9

C) (5/9)t – 20/3

D)(27/5)t +68

E) 3t +20

First, do the easy part: write the expression for the temperature in Fahrenheit.

20 + 3*t*

That whole expression is the temperature in Fahrenheit after *t* hours, so we need to put that whole expression into the conversion to Celsius.