Please help me with these questions and show how u got them, i will mark you brainliest !

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)

Find the solution(s) to x^2-14+49=0

286 divided by 457.6 what is the quotient?