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
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
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '08
 Folh
 Calculus, Derivative, Carbon monoxide, traffic flow

Click to edit the document details