Did I do it right? There were some more options like numbers too. Please let me know asap!

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30

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)

How are algebraic expressions evaluated using substitution?