T = pvnr
t = (pv)/(nr)
t = (nr)/(pv)
t = (npv)/r

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

Find the roots of the equation below. x^2 - 6 + 9 = 0

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=