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In madras,temperature at noon variesaccording to -t^2/2 + 8t+3, where t is elapsed time.Find how much temperature more or less in 4pm to 9pm

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Find the range of x*x -5x+6>0 if X=3 A bus started from bus stand 8.00am and after 30min staying at destination it returned back to the bus stand. The destination is 27 miles from the bus stand the speed of the bus 50percent fast speed at what time it returns to the bus stand.