Review Exercise on derivative (06)

Review Exercise on derivative (06) - English Expression 1...

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22 English Expression 1.微 微 differential 2.微 微 increment 3.微 微 微 differentiable 4.微 微 differential quotient 5.微 微 radius 6.微 微 微 approximate value 7.微 微 微 微 approximate computation 8. 微 微 difference quotient 9.微 微 微 微 difference equation 10.微 微 微 微 derivatives of higher order 11.微 微 formula 复复复复复复复复复复复复复 1复 Traffic Flow Opened in the late 1950s,the Central Artery in downtown Boston was designed to move 75,000 vehicles a day. The number of vehicles moved per day is approxi- mately by the function ) 5 0 ( 75 . 74 75 . 19 25 . 6 ) ( 2 + + = = t t t t f x where x is measured in thousands and t in decades, with t=0 corresponding to the beginning of 1959. Suppose the average speed of traffic flow in mph is given by ) 350 75 ( 5 . 67 00075 . 0 ) ( 2 + - = = x x x g S where x has the same meaning as before. What was the rate of change of the average speed of traffic flow at the beginning of 1999? What was the average speed

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Review Exercise on derivative (06) - English Expression 1...

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