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3, The owner of a gelato ice-cream stand keeps records of the demand, d, in thousands of cones, versus time, t, in years, relative to a base year of 2010 (i.e. t = 0 at year 2010). She performs a sinusoidal regression on the data and arrives at the model d=4 sin (0.72t+0.2)+6 (a) What is the demand in 2010? (Round your answer to the nearest integer.) (1) Determine the average demand for the gelato ice-cream from 2010 to 2021. (ii) Is it a good idea to predict the demand for the gelato ice-cream from 2021 to 2022 using the answer in (b)(i)? If yes, provide a reason. If no, suggest another way to predict the demand. [8 marks]