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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.

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

For what value of (y) is 3^3/3^y =1/9