1. Exercise 1.1, #61a.
b. -[
2. Exercise 1.2, #41
Let C = cost, R = revenue, P = profit then,
Maximum profit is when optimal price is $21 per game
30 sets will be sold each week.3. Exercise 1.3, #37Let and
4. Exercise 1.3, #46a. NF(N)
1,00050,000
10,000500,000
10,000400,000
20,000800,000
20,000700,000
50,0001,750,000
b.
5. Exercise 1.4, #3a. b. Producing 20,000 units gives a profit
of $43,000.
Producing 5,000 units gives a loss of $2,000.
xy
020
3041
7262
10055
6. Exercise 1.4, #32a.
b. Split equally between the 2; use since Profit = 51 thousand
dollars
c. Express P in terms of y; * We know that so
7. Exercise 1.4, #42a. Average yield: The total yield:
b.
c.
The grower should grow 80 trees to maximize yield.
8. Exercise 1.4, #52
a.
; 200 tables must be sold to breakeven
b.
; 240 tables must be sold to make a profit of $6,000
c. There will be a loss of $7,500 if 150 tables are sold.
d.
9. Exercise 1.6, #48The graph is discontinuous at and. The
company bought more inventories during those months.
10. Exercise 2.1, #50a. b.
The average change in consumer expenditures is -$115 per
unit.
c. The instantaneous rate of change is -$80 per unit when . The
expenditure is decreasing when .
11. Exercise 2.2, #64Let be the GDP in billions of dollars where
is years and represents 1995. Since the GDP is growing at a
constant rate, is a linear function passing through the points
(0,125) and (8,155).Then Then In 2010, and the model predicts a GDP
of billion dollars.
12. Exercise 2.4, #66
13. Exercise 2.5, #1a.
b.
c.
d.
e.
14. Exercise 2.5, #13a. Marginal cost = Derivative of total cost
function
b.
$244
15. Exercise 2.5, #24
more worker-hours are needed
16. Exercise 2.6, #55
17. Exercise 3.1, #59a.
b.
207 units will be sold
c.
is the maximum point $11,000 should be spent on advertising to
maximize sales2,264 units is the maximum sales level
18. Exercise 3.2, #55a.
1,000 units will be sold
b.
Inflection point when x = 11.
Sales are increasing at the largest rate when $11,000 is spent
on marketing.
19. Exercise 3.3, #46a. Vertical Asymptote: x=0To find
x-intercept:
Since a square root cannot equal a negative, this equation has
no solutions, meaning there is no x-intercept.
To find the y-intercept:
This cannot be done, since it would result in a zero in the
denominator, so there is no y-intercept.
Horizontal Asymptote
Since the degree of the numerator (2) exceeds the degree of the
denominator (1), there is no horizontal asymptote.
b. The average cost curve C(x) approaches the line as x gets
larger.
c.
20. Exercise 3.4, #19a.
P(q) is maximized at q=7
b.
A(q) is minimized at .
21. Exercise 3.4, #27
E(10) < 1 inelastic
22. Exercise 3.4, #47Let h(x) = number of units assembled if the
break is taken hours later after 8:00 am
(Minimum)
(Maximum)
=
23. Exercise 3.5, #6Where x is the price
At a price of per book the profit P(x) is maximized at
$2,420.
24. Exercise 3.5, #27Let , , , and then,
++(*)
25. Exercise 3.5, #35
5 years from now
26. Exercise 4.1, #39a.
b.
27. Exercise 4.1, #61
28. Exercise 4.2, #47
Let
29. Exercise 4.3, #65a.
Elastic for p > 25; or Inelastic for p < 25; or Of unit
elasticity for p = 25; or
b. When , the demand is
The elasticity of demand is Thus, an increase of 1% in price
from will result in a decrease in the quantity demanded by
approximately 0.6%. Consequently, an increase of 2% in price, from
$15 to $15.3, results in a decrease in demand of approximately,
from 1,646 to 1,626 units.Demand will decrease by approximately
1.2%c.
30. Exercise 4.3, #73a.
Value is decreasing at the rate of $1,082.69 per year.
b.
Constant rate of 40% per year
31. Exercise 4.4, #25 (graph) (t, y)a. As
b. represent those that will floating at the end of the day
10This is about 74%
c.
About 8.9% will sink from 15th to 20th day.
32. Exercise 4.4, #42a.
b.
The function can be used to evaluate the effectiveness of a
training program because as it clearly indicates, by removing the
units produced by the new workers who took no special training, we
can determine the level of units produced by the average workers
after having the special training.The program after 5 weeks as well
as after 7 weeks are both effective, because both of them yielded
positive results. However, the training program after 5 weeks is
more effective for it depicts larger remainder after deducting the
units produced by the workers who do not take the program from the
ones who took. Hence, that residual amount represents the
additional units that a worker can produce after taking the
training program.
33. Exercise 5.1, #47
3,253
34. Exercise 5.2, #54Let ,
35. Exercise 5.3, #47
36. Exercise 5.3, #60st week
From 7 to 14 = 2nd week
37. Exercise 5.4, #34
38. Exercise 5.4, #45a.
14.7 yearsb.
$582,221
c.
39. Exercise 5.5, #5a.
b.
40. Exercise 5.5, #13
Producers Surplus
41. Exercise 5.5, #21a. 11 years
b.
Evaluating from to , the profit is $26,620.
c.
42. Exercise 5.5, #29
43. Exercise 5.5, #37a.
b. 9.12 years
c.
$1,218 billion
d. Answers will vary
44. Exercise 5.5, #46
45. Page 466, #68
Total manufacturing cost from 10 13 units.