A physicist must make sure that the temperature of a metal at 0 deg C gets no colder than -80 deg C. The physicist changes the metal's temperature at a steady rate of -4 deg C per hour. For how long can the physicist change the temperature?
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For 20 hours
For every hour the temperature reduced by 4
So -4 * x = -80. X is no. Of hours
Divide both sides with -4 to find which gives 20
For every hour the temperature reduced by 4
So -4 * x = -80. X is no. Of hours
Divide both sides with -4 to find which gives 20
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