18. To save energy, an office building is only heated during business hours. Office Building Temperature Temperature (°C) time a) When is the temperature: Time 1.S [3A] 15 20 i) Constant? ii) Decreasing(20) iii) Increasing? 2) 8 68 (0₁6) and (20, 24) Constant = (5, 22) 1615,16 2) X b) Calculate the rate of change during each time period from part a. PROCinerary resubmit

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