The graph shows the daily megawatts of electricity used on a record-breaking summer day in Sacramento. Electricity Use a) Is this the graph of a function? Why? b) What is the domain? What is the range? 2500 2300 c) Estimate the number of megawatts used at 8am. Call the function f. Give the answer using function notation. 2100 1900 1700 1500 d) At what time was the most electricity used? the least? 1300 1100 900 e) What is f(12)? What does it mean? 700 12 16 Noon 4 8 20 24 f) During what time intervals is electricity usage increasing? Decreasing? Constant Hours Megawatts

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