the equation f=9/5c+32 relates to a temperature in degrees farenheit F to the equivalent temperature in degrees Celsius C

I think the teacher want you to make C  the subject.  

Great. What's the question? :)

Thats what i said when i saw the b****y question?

That is the question!!

Are you sure? 

In that case...I don't know what to tell you. Ask your teacher maybe?