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Question 20 (5 points) Listen The normal monthly temperatures ('F) for Omaha, Nebraska, are recorded below. Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 4 10 11 12 Temp. 210 270 39 570 620 720 770 740 65 530 390 250 a. Write a sinusoidal function that models Omaha's monthly temperature variation. b. Use the model to estimate the normal temperature during the month of April. Oay= 28cos =t- 6 + 49 b. y(4) = 490 Oay= 49 cos -1- + 28 b. y(4) = 560 Jay= 28 sin -t- + 49 b. y(4) = 490 Jay= 28 cos + 49 12 b. y(4) = 490