For a scientific experiment, a physicist must makd sure that the temperature of a metal does not get colder than - 80 ° C. The metal begins the experiment at 0 ° C and is cooled at a steady rate of - 4 °C per hour. How long can the experiment run?
A. Let t represent time in hours. Write an inequality. Use the fact that the rate of change in temperature times the number of seconds equals the final temperature.
__________
B. solve the inequality in part a. how long will it take the physicist to change the temperature of the metal? ___________
C. The physicist has to repeat the experiment if the metal gets cooler than - 80 °C. How many hours would the physicist have to cool the metal for this to happen ? ____________
