Percentage of Rise in Temperature

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%
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sid08harth

  • May 27th, 2010
 

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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