The number of hours, h, it takes for a block of ice to melt varies inversely as the temperature, t. if it takes 3 hours for a square inch of ice to melt at 60 degrees, find the constant of proportionalitya.150c.210b.180d.200

The equation which describes the indirect variation of hours and the temperature is, 
                                           h = k / t
where k is the constant of proportionality.
Substituting the known values to the given equation above, 
                                          3 hours = k / 60 degrees
Solving for k gives an answer of 180. Thus the answer is letter b. 180. Note that in the choices, letter b is written after letter c. 

$22. if larry's profit were to minimize by one for every hour his store were to be closed, we would subtract 30 by 8.