An on-demand printing company has monthly overhead costs of $1200 in rent, $420 in electricity. $100 for phone service, and $200 for advertising and marketing. The priming cost is $40 per thousand Pages for paper and ink. a. Write a cost function to represent the cost C x for printing x thousand Pages for a given month. b. Write a function representing the average cost C ¯ x for printing x thousand Pages for a given month. c. Evaluate C ¯ 20 , C ¯ 50 , C ¯ 100 , and C ¯ 200 . d. Interpret the meaning of C ¯ 200 . e. For a given month, if the printing company could print an unlimited number of Pages, what value would the average cost per thousand Pages approach? What does this mean in the context of the problem?
An on-demand printing company has monthly overhead costs of $1200 in rent, $420 in electricity. $100 for phone service, and $200 for advertising and marketing. The priming cost is $40 per thousand Pages for paper and ink. a. Write a cost function to represent the cost C x for printing x thousand Pages for a given month. b. Write a function representing the average cost C ¯ x for printing x thousand Pages for a given month. c. Evaluate C ¯ 20 , C ¯ 50 , C ¯ 100 , and C ¯ 200 . d. Interpret the meaning of C ¯ 200 . e. For a given month, if the printing company could print an unlimited number of Pages, what value would the average cost per thousand Pages approach? What does this mean in the context of the problem?
An on-demand printing company has monthly overhead costs of
$1200
in rent,
$420
in electricity.
$100
for phone service, and
$200
for advertising and marketing. The priming cost is
$40
per thousand Pages for paper and ink.
a. Write a cost function to represent the cost
C
x
for printing x thousand Pages for a given month.
b. Write a function representing the average cost
C
¯
x
for printing x thousand Pages for a given month.
c. Evaluate
C
¯
20
,
C
¯
50
,
C
¯
100
,
and
C
¯
200
.
d. Interpret the meaning of
C
¯
200
.
e. For a given month, if the printing company could print an unlimited number of Pages, what value would the average cost per thousand Pages approach? What does this mean in the context of the problem?
(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
Evaluate the integral using integration by parts.
Sx² cos
(9x) dx
Let f be defined as follows.
y = f(x) = x² - 5x
(a) Find the average rate of change of y with respect to x in the following intervals.
from x = 4 to x = 5
from x = 4 to x = 4.5
from x = 4 to x = 4.1
(b) Find the (instantaneous) rate of change of y at x = 4.
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