Laurie is measuring the temperature in her back yard. At 4 P. M. she measures –8 degrees Celsius.
For the next 2 hours, the temperature decreases by
3 degrees Celsius per hour. What is the temperature
at 6 P. M., in degrees Celsius?

The temperature at 6 P.M. is -14°C

Explanation:

The temperature at 4 P.M. = -8 degrees Celsius

The duration over which the temperature decreases by 3 degrees = 2 hours

The total decrease in temperature = 2 × 3 = -6°C

There the temperature change after 2 hours = -8°C -6°C = -14°C

The time change after 2 hours = 4 P.M. + 2 hours = 6 P.M.

Therefore, the temperature time after 2 hours = 6 P.M.

Which gives;

The temperature at 6 P.M. = -14°C.