Question

For an experiment, the temperature of a liquid must stay above 60°F . The starting temperature of the liquid is 90°F . It is placed in a cooler, which lowers its temperature 3°F each minute. Let m represent the number of minutes the liquid is in the cooler. Which statement determines how many minutes the liquid can stay in the cooler? The liquid must be in the cooler fewer than 10 minutes. The liquid must be in the cooler fewer than 15 minutes. The liquid must be in the cooler fewer than 30 minutes. The liquid must be in the cooler fewer than 60 minutes.

Answer 1

The first one is the answer because if you cant let the liquid reach lower than 60 degrees you cant let it lower more than 30 degrees so 30 divided by the degrees decreased each minute 3 degrees you get 10 minutes.