Precalc exponential decay
Assume the numbewr of hours milk stays fresh decreases exponentially with temperature. Suppose that the milk in the refrigerator at 32 degrees F will keep for 192 hours, and milk left out in the kitchen at 68 degrees F will keep for only 48 hours. Let h be the number of hours the milk keeps, write the equation.

I know in Celsius the degrees are 0 and 20, so you can plug in 192=a*0b and find out a=192, but how can you solve the problem when the value is not 0?

Question

Precalc exponential decay
Assume the numbewr of hours milk stays fresh decreases exponentially with temperature. Suppose that the milk in the refrigerator at 32 degrees F will keep for 192 hours, and milk left out in the kitchen at 68 degrees F will keep for only 48 hours. Let h be the number of hours the milk keeps, write the equation.

I know in Celsius the degrees are 0 and 20, so you can plug in 192=a*0b and find out a=192, but how can you solve the problem when the value is not 0?