City urbanization City planners model the size of their city using the function A ( t ) = − 1 50 t 2 + 2 t + 20 . for 0 ≤ t ≤ 50, where A is measured in square miles and t is the number of years after 2010. a. Compute A ′( t ). What units are associated with this derivative and what does the derivative measure? b. How fast will the city be growing when it reaches a size of 38 mi 2 ? c. Suppose that the population density of the city remains constant from year to year at 1000 people/mi 2 . Determine the growth rate of the population in 2030.
City urbanization City planners model the size of their city using the function A ( t ) = − 1 50 t 2 + 2 t + 20 . for 0 ≤ t ≤ 50, where A is measured in square miles and t is the number of years after 2010. a. Compute A ′( t ). What units are associated with this derivative and what does the derivative measure? b. How fast will the city be growing when it reaches a size of 38 mi 2 ? c. Suppose that the population density of the city remains constant from year to year at 1000 people/mi 2 . Determine the growth rate of the population in 2030.
City urbanization City planners model the size of their city using the function
A
(
t
)
=
−
1
50
t
2
+
2
t
+
20
. for 0 ≤ t ≤ 50, where A is measured in square miles and t is the number of years after 2010.
a. Compute A′(t). What units are associated with this derivative and what does the derivative measure?
b. How fast will the city be growing when it reaches a size of 38 mi2?
c. Suppose that the population density of the city remains constant from year to year at 1000 people/mi2. Determine the growth rate of the population in 2030.
Given lim x-4 f (x) = 1,limx-49 (x) = 10, and lim→-4 h (x) = -7 use the limit properties
to find lim→-4
1
[2h (x) — h(x) + 7 f(x)] :
-
h(x)+7f(x)
3
O DNE
17. Suppose we know that the graph below is the graph of a solution to dy/dt = f(t).
(a) How much of the slope field can
you sketch from this information?
[Hint: Note that the differential
equation depends only on t.]
(b) What can you say about the solu-
tion with y(0) = 2? (For example,
can you sketch the graph of this so-
lution?)
y(0) = 1
y
AN
(b) Find the (instantaneous) rate of change of y at x = 5.
In the previous part, we found the average rate of change for several intervals of decreasing size starting at x = 5. The instantaneous rate of
change of fat x = 5 is the limit of the average rate of change over the interval [x, x + h] as h approaches 0. This is given by the derivative in the
following limit.
lim
h→0
-
f(x + h) − f(x)
h
The first step to find this limit is to compute f(x + h). Recall that this means replacing the input variable x with the expression x + h in the rule
defining f.
f(x + h) = (x + h)² - 5(x+ h)
=
2xh+h2_
x² + 2xh + h² 5✔
-
5
)x - 5h
Step 4
-
The second step for finding the derivative of fat x is to find the difference f(x + h) − f(x).
-
f(x + h) f(x) =
= (x²
x² + 2xh + h² -
])-
=
2x
+ h² - 5h
])x-5h) - (x² - 5x)
=
]) (2x + h - 5)
Macbook Pro
Chapter 3 Solutions
Calculus: Early Transcendentals and MyLab Math with Pearson eText -- Title-Specific Access Card Package (3rd Edition) (Briggs, Cochran, Gillett & Schulz, Calculus Series)
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