# MATH 22-006 (Spring 1999)

Errors in the textbook:

p.54, 1.4
Example 4.6, Solution to part (b)
R(x) should be 110x, not 100x. That is:
P(x) = R(x) - C(x) = 110x - (7500 + 60x) = 50x - 7500

pp.92-93, Chapter 1 Review
In problems 31-32, "evaluate" is misspelled.

p.129, 2.4
In problem 14, the function should be f(t) instead of f(x).

p.153, 2.5
In problems 37-40, find THE equation of the tangent line.

p.172, 2.7
EXAMPLE 7.5 should be in blue.

p.177, Chapter 2 Summary
Chain rule for powers
should be derivative of [h(x)]n

p.190, 3.1
The warning applies to Step 3 (not 2).

p.242, 3.4
In problem 19, replace 1200 with 1600 in both places.

p.260, 3.5
In the directions for problems 5 through 10, P(x) should be P(q).

There are also several errors in the answer section in the back:

p.754, 1.1
#59(b) C[q(3)] = \$6600, not C(3) = \$6600
#59(c) C[q(t)] = \$11,000, not C(t) = \$11,000

p.756, 1.2
#29 graph of y = x3 - 6x2 appears to have a local min at (5,-25) when in fact the function is increasing there

p.768, Chapter 1 Review
#15 The points should have coordinates (0,1.10) and (9,1.28).

p.771, 2.1
answers for #19 and #21 are interchanged

p.773, 2.3
#17(b) should be 17.53% per year
#21 should be 6.52% per year

p.773, 2.4
#3 should be 20%
#33(b) should be \$4.50
#33(d) should be \$7.80

p.774, 2.5
#47 should be decreasing by 12% per month

p.775, 2.6
#25 should be +0.2714 hundred units/month or +27 units/month

p.776, 2.7
#23(b) 0 per year per year
#23(c) Decrease of 500 people per year
#23(d) Decrease of 521 people per year

p.778, Chapter 2 Review
#23 replace 0.172 with 0.309

p.783, 3.2
#21 graph should go through the origin, but it misses

p.786, 3.3
#13 minima (not minimums) and maxima (not maximums)

p.787, 3.4
#19 replace 900 with 1200, 3000 with k, and x = 1200 with x = 1600

p.788, 3.5
#9(a) replace commas with decimal points in R(q) and R'(q)

p.790, Chapter 3 Review
#7 relative minima, not minimums
#19 relative maxima, not maximums

p.793, 4.1
#5 graph should be symmetric about the y-axis (the righthand portion is correct)

p.795, 4.2
#19(a) horizontal asymptote should be y = 2, not y = 20

p.796, 4.3
#9 rounded answer should be 11.552, not 11.553
#17 rounded answer should be 1.820, not 1.821
#21 exact answer (not given) is 5 ln(2)

p.797, 4.4
#25 (-1,-1/e) is rel min, (-2,-2/e2) is inf pt

p.804, 5.2
#13 replace x5 with y5
#31 replace < with >
#39 exact answer (not given) is 7/3 meters

I'm sure there are others I have missed. If you find any, please pass them along.