The figure shows the power consumption in San Francisco for a day in September (

Question

The figure shows the power consumption in San Francisco for a day in September (P is measured in megawatts; t is measured in hours starting at midnight) P (MW) 800 600 400 200 0 3 6 9 12 15 18 2 (h) (a) What was the power consumption at 6:00 A.M.? MW What was the power consumption at 6:00 P.M.? MW (b) When was the power consumption the lowest? (c) When was the power consumption the highest? ht (d) Find the net change in the power consumption from 9:00 A.M. to 7:00 P.M. MW Need Help? Read It Watch It Master It

Explanation / Answer

a. When t=6, P(t)=500

Therefore at 6am power consumption was 500MW

6pm means t=18

And att=18,P(t)=700MW

b.The graph is at its lowest at t=400h and highest at t=2400hrs

d. Netchange=(700-800)/10=-10MW

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