1)
The temperature on a particular day can be modeled by the function
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Where t is the time elapsed, in hours, after 5am and C is the temperatures in degrees Celsius.
Find the maximum temperature and the time when this temperature is reached.


2)
A plane is to fly 3000 km at a speed of   v km/h. when flying at   v km/h, the plane consumes fuel at the rate of (50 + 0.00001v3次方) litres per hour.
Find the speed for the greatest fuel economy and the amount of fuel used at this speed.


3)
a manufacturer's total cost function is given by
C = (q^2)/4 + 3q + 400 where c is the total cost of producing q units.
at what level of output will average cost per unit be a minimum? What is this minimum?

繳交日期係12/1

[ 本帖最後由 bbq55 於 2007-1-6 08:27 PM 編輯 ]

THANK YOU SO MUCH!!!
第1條個圖係
c = -4cos(πt)/12 +14
希望幫一幫我啦