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⟩ The temperature at Chennai is given by the function -t2/6+4t+12 where t is the elapsed time since midnight. What is the percentage rise (or fall) in temperature between 4.00 PM and 9.00 PM?(a) 23.5%(b) 33%(c) -32.5(d) 20%(e) 46%

4pm is 16 hours from midnight..9pm is 21 hours from midnight

for 4pm...we get..-16*2/6+4*16+12 = 89

for 9pm...we get..-21*2/6+4*21+12 = 71 (approx)

% change = 18/89 *100 = 20% (Approx)

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