To convert degrees fahrenheit (f) into degrees celsius (c) use the formula 2003-05-04-00-00_files/i015.jpg. rewrite the equation to convert degrees celsius to degrees fahrenheit.
a.
2003-05-04-00-00_files/i0150001.jpg
b.
2003-05-04-00-00_files/i0150002.jpg
c.
2003-05-04-00-00_files/i0150003.jpg
d.
2003-05-04-00-00_files/i0150004.jpg

To covert degrees Fahrenheit (F) to degrees Celsius (C) we use the equation C = (F - 32) × 5/9 . To convert degrees Celsius (C) to degrees Fahrenheit (F) we have to rewrite the equation. 
First step: Divide both sides by 5/9. The equation would look like this: 
C(9/5) = (F - 32) 

Second step: Add 32 on both sides. 
32 + (9/5)C = F or F = 32 + (9/5)C

Im not that good with division but i think 5 is -6but dont quote me on thatim not the best in division but thats my answer

Answer: 900°

good luck on your studies! : )

david edward.