In the mystery number problem below, Rosa identified the missing number as 4. Is she correct? How can you check her answer? (pls help) (pls no link i need to know its real and not a scam)

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)